蛛丝以液体的形式从这些开口流出，当它们一接触到空气就变成了细丝。
Silk comes out of these openings as a liquid, and, as it reaches the air, it becomes tread-like.
它的作用是在热水器使用中水流出的时候吸入空气。
动物粪便的流出物还污染了水道，未遮盖的粪堆释放出的氧化亚氮（ N2O） ，还会污染空气。
Run-off from animal manure also fouls watercourses, and the release of nitrous oxides from uncovered dung heaps pollutes the air.
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