Water is thought to be crucial for life because it provides a medium for nutrients to diffuse into cells and wastes to drift out, and a solvent for critical metabolic reactions.

水被认为对生命是至关重要的，因为水是营养物渗入细胞以及废物排出的媒介，也是关键新陈代谢反应的溶剂。

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The simulator proves that when sweet and salt water join, the concentration will diffuse until the salinity is equal in the total fluid.

这个模拟器证明当淡水和海水混合时，浓度会一直扩散，直到在液体中盐分完全均等。 如果在淡水和海水中放置一张选择膜，就可以控制扩散程度、获得潜在能量。

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Diffuse pollution is one of the important sources that cause the deterioration of water quality in city.

城市面源污染是我国水环境质量恶化的重要原因之一。

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So depending on the relative humidity and temperature, 100 or more water molecules diffuse out of the leaf for every molecule of carbon dioxide that diffuses in.

WSJ: Harrison H. Schmitt and William Happer: In Defense of Carbon Dioxide

The contribution of diffuse sources of pollution to bathing water failures, both rural and urban, is being investigated.

BBC: Beaches 'need to improve'