The rotation converts an electrochemical stimulus - the movement of protons - into chemical energy.

旋转传输电化学刺激，运动的质子产生化学能。

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Hydrotropism (hydrotropic movement) a tropism in which the stimulus is water. It is a special kind of chemotropism.

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。

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Chemotropism (chemotropic movement) A TROPISM in which the stimulus is chemical.

刺激物是化学物质的一种向性。

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Watts said he was "encouraged" that Daschle's speech might indicate the possibility of some movement on economic stimulus.

CNN: story.ap.daschle.jpg

But the tea-party movement holds it in particularly low regard, seeing it as the monetary bedfellow of the hated stimulus and bail-outs.

ECONOMIST: The politics of the Fed