肌肤容易受刺激，粗糙和敏感。

Skin is easily irritated, chapped, chafed, and sensitized.

《柯林斯英汉双解大词典》

一受刺激，身体里边就分泌激素。

Once stimulated, the body inside will produce hormone.

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当胎儿在第一次接受刺激时，他被震惊。

When the fetus first receives the stimulation, it is startled.

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Well, then you could imagine a cycle here where activation of the receptor is leading to production of more ligand, is leading to activation of the receptor and production of a ligand.

那么,你就能画出一个循环图,激活受体能导致,更多配体的生成,这些配体又会刺激受体生成更多配体

耶鲁公开课 - 生物医学工程探索课程节选