Nitric oxide (NO) is a physiologically reactive substance, as a plant cell signaling molecule, it play an important role in plant root growth and other physiological processes.

一氧化氮(NO)是一种高活性生理活性物质，作为信号分子在植物根系生长等生理过程中起重要作用。

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Nitric oxide is an important signaling molecule in insects that is involved in olfaction, vision, touch, development, defensive behavior and learning.

一氧化氮作为一种重要的信息分子，参与调节昆虫嗅觉、视觉、机械感受、发育、机体防御及学习行为。

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While lips burn and eyes water, blood vessels actually relax, thanks to increased production of the signaling molecule nitric oxide.

当人被辣到呲牙咧嘴、眼泪汪汪的时候，血管其实便会松弛，这是由于辣椒素增加了信号分子一氧化氮的数量。

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