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 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.
与之相反，新的研究包括全部范围的污染物，包括二氧化硫，氮氧化物和水蒸汽。
Instead, the new study included a full range of pollutants, including sulfur dioxide, nitrogen oxide and water vapor.
去除阮病毒的污染是个复杂的事情，研究表明用化学试剂清洗可以降低或者增加阮病毒对蒸汽灭菌的抑制。
Removal of prion contamination is a complicated matter, with studies showing that cleaning chemistries can decrease or even increase the resistance of prion contamination to steam sterilization.
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