泡沫材料可以使液体燃料流经油管，减少由于凝结和蒸发造成的汽油损失。
The foam allows the liquid fuel to pass through the gas lines, and conserves gasoline lost due to condensation and evaporation.
反式脂肪是不饱和脂肪，它是活跃的，可导致液体蒸发和脂肪凝固。
A trans fat is an unsaturated fat which is heated, causing the fluids to evaporate and the fat to solidify.
根据水的蒸发现象，人们知道液体在一定的条件下能变成气体。
From the evaporation of water, people know that liquids can turn into gases under certain conditions.
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