雅思阅读 061 — Microbubbles Help Spread Microplastics Through Our Water

改编自 Scientific American（2026-01，Jackie Flynn Mogensen）。原文研究发表于 Science Advances，高级作者为都柏林三一学院 John Boland。

🎧 课文朗读音频（约 1 分钟）

Reading Passage

If you read the research on microplastics, these pollutants appear to be as frightening as they are ubiquitous. Found throughout our bodies, food and environment, both microplastics and their chemical ingredients have been linked to heart attacks, stroke, respiratory conditions, fertility issues and premature death — to name just a few concerns.

Yet despite these traits, scientists do not fully understand how all the minuscule filaments of plastic get into our environment. A study published last month in Science Advances offers some new clues as to how water itself may be contributing to their spread.

Scientists already knew that plastics degrade through exposure to sunlight and repeated weathering by waves, sand or other debris. But the new study suggests that contact with water itself is also a factor: in both marine and river environments, researchers found that microbubbles can form on the surface of a piece of plastic, break it down, and release tiny, practically invisible plastic bits into the surrounding water.

From there, nanoplastics and microplastics often enter the food chain — and, in turn, us. An estimated 130 million metric tons of plastic waste enter our bodies and the environment every year, with that number on track to more than double by 2040.

The process works as follows. When waves agitate water, tiny air bubbles nucleate on microscopic scratches and imperfections in the plastic surface. As these bubbles grow and eventually collapse, the shock waves and localised pressure spikes sheer off nanoscale fragments. Because the particles are so small, they pass easily through gills, cell walls and biological barriers that larger microplastics struggle to penetrate. Once in the water column, they are ingested by zooplankton, filter-feeding shellfish and small fish, and then move upward through the food web.

The results, the researchers write, could inspire future research on how to control the release of microplastics into, well, everything. "Plastic degradation is an invisible threat to the environment and human health," said John Boland, a professor in the School of Chemistry at Trinity College Dublin and senior author of the study, in a statement. "Society urgently needs to come to grips with the enormity of the challenge posed by our ubiquitous use of plastics."

The finding also complicates common assumptions about which environmental conditions are safest. Conventional wisdom holds that sealed, dark storage protects plastic from degradation; the new work implies that simply immersing plastic in agitated water is enough to accelerate fragmentation, even without ultraviolet light. That raises particular concern for wastewater treatment plants, river deltas and coastal surf zones, where bubbles are continuously generated.

Boland's team is now investigating whether chemical coatings or surface treatments could suppress bubble nucleation on plastic items already in the environment. But he cautions that such engineering fixes address the symptom, not the disease. "We will not engineer our way out of this with better plastics," he says. "We need less plastic, period."

For consumers, the practical takeaway is modest but worth noting: even plastics labelled "marine-safe" or "biodegradable" may shed nanoplastics through bubble-driven weathering once they enter natural water bodies. Waste-reduction strategies, rather than material substitutions alone, are likely to offer the only durable solution.

Questions

Questions 1–5: Do the following statements agree with the information given in the passage?

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.

1. Microplastics have been associated with multiple serious health conditions in humans.
2. Scientists have a complete understanding of how microplastics enter the environment.
3. Plastic degradation by sunlight has been known to researchers for some time.
4. The new study found that water itself can break plastic down into smaller particles.
5. By 2040, the annual volume of plastic waste entering the environment will have halved.

Questions 6–10: Choose the correct letter, A, B, C or D.

6. According to the passage, microbubbles form on plastic surfaces because of

   • A. chemical reactions with oxygen
   • B. microscopic imperfections and wave agitation
   • C. ultraviolet radiation
   • D. bacterial activity

7. The newly released plastic fragments are especially dangerous because they

   • A. dissolve in seawater immediately
   • B. cannot be filtered by any existing technology
   • C. are small enough to pass through biological barriers
   • D. emit toxic gases as they degrade

8. According to the passage, nanoplastics move up the food chain by first being consumed by

   • A. large predatory fish
   • B. marine mammals
   • C. zooplankton and filter feeders
   • D. sea birds

9. What concern does the new finding raise about "marine-safe" plastics?

   • A. They are more expensive than ordinary plastics.
   • B. They may still release nanoplastics through bubble-driven weathering.
   • C. They cannot be recycled.
   • D. They break down only on land.

10. Professor Boland believes that the most effective long-term solution is to

    • A. develop chemical coatings for plastic
    • B. replace ordinary plastic with biodegradable alternatives
    • C. reduce plastic use overall
    • D. build better wastewater treatment plants

Questions 11–13: Complete the sentences below. Choose NO MORE THAN TWO WORDS from the passage for each answer.

11. The new research was published in the journal __________.
12. Senior author John Boland is based at __________ in Dublin.
13. Under heat or agitation, collapsing bubbles produce localised __________ that shear off tiny plastic fragments.

Answers

1. TRUE
2. FALSE (科学家并没有完全理解)
3. TRUE
4. TRUE
5. FALSE (到 2040 年会翻倍，而不是减半)
6. B
7. C
8. C
9. B
10. C
11. Science Advances
12. Trinity College
13. pressure spikes

Glossary (IELTS 高频词)

• ubiquitous /juːˈbɪkwɪtəs/ adj. 无处不在的
• degrade /dɪˈɡreɪd/ v. 降解
• filament /ˈfɪləmənt/ n. 细丝
• nucleate /ˈnjuːklɪeɪt/ v. 形成核，成核
• sheer off /ʃɪər/ v. 切断，剥落
• penetrate /ˈpenətreɪt/ v. 穿透
• zooplankton /ˌzuːəˈplæŋktən/ n. 浮游动物
• nucleation /ˌnjuːkliˈeɪʃn/ n. 成核
• coating /ˈkəʊtɪŋ/ n. 涂层
• symptom /ˈsɪmptəm/ n. 症状