The bright yellow arcs that streak the marine cloud layer are ship tracks—clouds that form when water vapor condenses onto the myriad tiny pollution particles in ship exhaust.
划过海洋云层明亮的黄色弧线是船舶的航迹——那是些由水蒸汽与船舶排放出来的无数污染微粒凝结而成的云。
The pollution had destroyed ozone layer and caused many changes in weather.
污染破坏了臭氧层，并引起了许多天气变化。
Investigation of pollution situation of bottom layer of a landfill by boring sampling was carried out.
通过钻探取样对一个垃圾场底部土层的污染状况进行了现场调查。
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