翻译和例句:
it.Normally, water forms beads (水珠) on glasses. But when one applies surfactant (表面活性剂), the beads come together to make a sheet of water. Surfactant is a chemical that lowers the surface tension (表面 ……
surfactants (肺表面活性剂). This fluid acts like a lubricant (润滑剂), making it easier for the lungs to expand... study discovered that sighing helps balance a fluid in the lungs called pulmonary surfactants (肺表面活性剂 ……
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