雅思阅读 34: The Long Wait for Electric Flight（电动航空的漫长等待）

改编自 Future Green Tech / industry analysis（2026年）。雅思阅读 Section 3 难度，约 1050 词。 素材来源：https://futuregreentech.com/articles/electric-aviation

Reading Passage

A. For more than a decade, a certain vision of the future has circulated at airshows and in the roadshows of eager start-ups: quiet, battery-powered aircraft lifting vertically from pads atop city skyscrapers and ferrying commuters to airports in minutes. These "electric vertical take-off and landing" vehicles, known as eVTOLs, promise to replace the helicopter's racket with an almost silent hum and to dispense with the exhaust fumes that trail behind every conventional airliner. The appeal is obvious: the roads into most major airports are choked for hours each morning, and a vertical hop over the traffic would, in principle, erase that wasted time. Engineers point to a genuine technical advantage behind the glamour. Rather than one large engine, such aircraft distribute many small electric motors and propellers across the wings or body, a configuration that offers built-in redundancy — if one motor fails, the others can compensate and the aircraft can still land safely — and unusually precise control. Electric motors also have far fewer moving parts than jet engines, which should simplify maintenance and reduce the time an aircraft spends grounded. It is an attractive package, and it has attracted billions of dollars of investment from the world's largest aircraft manufacturers and carmakers alike.

B. Yet for all the enthusiasm, a single physical quantity governs how soon this vision can become routine: the energy stored in a battery relative to its weight. Kerosene carries roughly twelve thousand watt-hours in every kilogram of fuel; a modern aviation-grade lithium-ion pack stores, by contrast, between 250 and 300 watt-hours per kilogram once the packaging, cooling systems and protective casing are all included. The gap is not a matter of a few percentage points. To carry the same amount of energy, a battery needs to be about fifty times heavier than the fuel it replaces, and, worse, unlike kerosene it does not grow lighter as it is burned. Because an aircraft must lift its own weight, that penalty is felt immediately in the air: a heavier battery leaves less room for passengers, luggage and fuel itself. Once safety rules are applied and a reserve is kept for diversion or holding — a requirement that aviation regulators enforce without exception — a passenger-carrying electric aircraft is left with a practical range of little more than a hundred kilometres. That is far shorter than the early marketing materials implied, and it leaves almost no margin for a detour around bad weather.

C. That does not mean electric flight is pointless. Even a hundred-kilometre reach is enough for the journeys it was arguably always best suited to: hops between a city centre and its airport, shuttle flights between nearby towns, and scheduled services on short regional routes too thin to support a jet. On such legs, the silence of the motors, the low operating cost and the absence of local emissions turn what was once a niche service into an economically plausible one. A helicopter on such a route guzzles fuel and makes so much noise that it is unwelcome over residential areas and airports alike; an electric aircraft changes both equations at once. Several manufacturers have already completed manned flights with prototypes and are working through the long, demanding process of certification, which demands that every failure mode be tested in advance. The realistic opening market is therefore not the transcontinental jumbo jet but the short urban taxi and the thin regional route — exactly the segment where the modest battery is least embarrassed and where its quiet, cheap operation is most valued.

D. Range is, however, far from the only obstacle. An eVTOL cannot operate from an ordinary airport at the frequency its business case requires, because ordinary airports lie on the edge of cities and are designed for occasional landings rather than a shuttle running every few minutes. It needs dedicated "vertiports" — compact landing pads fitted with rapid chargers, noise management and access roads — placed where passengers actually want to begin and end their journeys, which usually means the middle of built-up areas. Very few cities have so far committed to building these at scale, and integrating dozens or hundreds of low-altitude aircraft into already crowded urban airspace raises regulatory questions that have yet to be fully answered: who has right of way, how collisions are avoided, and who is responsible when something goes wrong. Battery durability is a further worry. The rapid charging and heavy cycling that a high-frequency taxi service demands wears cells out quickly, reducing their capacity over months rather than years, which adds a recurring replacement cost that early business projections often understate.

E. Whether larger electric aircraft ever leave the ground depends on a steep rise in battery performance. Industry estimates suggest that commercially useful flight requires cells of 400 to 500 watt-hours per kilogram, while anything resembling a narrow-body airliner capable of crossing a continent would demand 600 to 800 — a threshold that no credible technology roadmap expects before the 2040s at the earliest, and possibly never on ordinary lithium-ion chemistry at all. In the meantime, hybrid designs that burn fuel in flight to generate electricity offer a compromise, extending range to several hundred kilometres, though they sacrifice some of the cleanliness and quiet that motivated the project in the first place. A handful of governments are providing a regulatory push; Sweden, for example, has required its domestic flights to be fossil-free by 2030, a deadline that pushes airlines toward whatever zero-emission technology can be made to work. Electric aviation is no longer science fiction, but its near-term future is likely to be a limited, carefully choreographed one: quiet, clean and short — rather than the airborne revolution its earliest promoters once promised.

Questions 1-4

Choose the correct heading for paragraphs B, C, D and E from the list of headings below.

List of Headings i. The physics problem that limits what a battery can lift ii. Why electric flight may still suit very short routes iii. The invention of the jet engine iv. The infrastructure and durability hurdles still ahead v. How eVTOL aircraft are made of plastic vi. What performance gains the future may require vii. The cost of air travel in the 1950s

1. Paragraph B: ____
2. Paragraph C: ____
3. Paragraph D: ____
4. Paragraph E: ____

Questions 5-8

Choose the correct letter, A, B, C or D.

5. What is cited as a genuine engineering advantage of eVTOL aircraft? A. They can fly faster than sound. B. Distributed motors provide redundancy and precise control. C. They require no pilot at all. D. They are made entirely of lightweight paper.

6. Why does the writer say a battery is so punishing for aircraft? A. It must be lifted along with everything else on board. B. It leaks energy into the atmosphere. C. It cannot be recharged at altitude. D. It weighs less than kerosene.

7. Which market does the writer consider most realistic for early electric flight? A. Transatlantic passenger routes. B. Long-haul cargo across oceans. C. Short urban and regional shuttle services. D. Military bombing missions.

8. What does the writer say about vertiports? A. They already exist in every major city. B. Few cities have committed to building them on a large scale. C. They are cheaper than ordinary airports. D. They require no electrical supply.

Questions 9-13

Do the following statements agree with the claims of the writer?

Write:

• TRUE if the statement agrees with the information
• FALSE if the statement contradicts the information
• NOT GIVEN if there is no information on this

9. Kerosene stores far more energy per kilogram than a lithium-ion battery.
10. Early marketing material accurately predicted the current range.
11. Several eVTOL manufacturers have already carried passengers on test flights.
12. Rapid charging extends the life of battery cells.
13. Sweden has ordered all its international flights to be fossil-free by 2030.

Questions 14-15

Complete the summary below using NO MORE THAN TWO WORDS from the passage.

Because a battery must be (14) __________ together with the rest of the aircraft, its weight penalty is felt immediately. For now, the most realistic use is short (15) __________ services between a city and nearby destinations.

答案与解析

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