地质特征暗示着火星上曾经流动着液态水，而现在悄无声息的死火山也曾经一度繁荣，在地表和火星内部进行着化学物质交换。
Geologic features imply that liquid water once flowed across the surface, and volcanic activity, now dead, once flourished, recycling chemicals and minerals between the surface and the interior.
粮食烘干是一个复杂的热质交换过程，粮食本身又是一种复杂的生物化学物质。
The grain drying is a complicated heat and substance exchange course, and grain itself is also a kind of complicated biochemistry matter.
沿海海—气界面化学物质的交换对生物地球化学循环起着十分重要的作用。
Chemical exchange at the air coastal sea interface plays an important role in coastal biogeochemical cycles.
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