向水性(向水运动)：是由于水分刺激而产生的向性运动，属于向化性的一种特殊类型。
Hydrotropism (hydrotropic movement) a tropism in which the stimulus is water. It is a special kind of chemotropism.
放牧能刺激土壤中的微生物活动，帮助水分的获取和碳的分离。
Grazing herds stimulate microbial activity in the soil, helping to capture water and separate carbon.
在空气中的激发态水分子放射出微波从而刺激邻近的水分子放射出更远的微波。
Excited water molecules in the air emit microwaves thatthen stimulate the emission of further microwaves by their neighbours (this ishow a laser works).
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