气孔运动与植物水分代谢密切相关。

Stomatal movement is an important topic in plant water metabolism.

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在缺乏水分时，(植物)一般用蒸发作为降温的手段。一株植物无法消除它从阳光中所吸收的热量，或是无法消除它在新陈代谢过程中积累起来的热量。

When it is short of water, a plant, which normally USES evaporation as a means of cooling, cannot rid itself of the heat it absorbs from sunlight or the heat that may build up from its own metabolism.

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水分代谢是植物基础代谢的重要组成部分，气孔开关精细地调节着植物水分散失和光合作用。

Water metabolism is an important part of plant metabolism. Stomatal opening and closing modulate water loss and photosynthesis.

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