随着我们年老，我们分泌更少能冲洗掉细菌的唾液，因此牙齿和牙龈更容易退化。

As we age, we produce less saliva, which washes away bacteria, so teeth and gums are more vulnerable to decay.

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据说芥末也能通过增加唾液和消化液的分泌来刺激食欲。

Mustard is also said to stimulate appetite by increasing the flow of saliva and digestive juices.

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一种让人想吃东西的胃分泌的生长激素也能“激活”你的鼻子，也许能让鼻子更容易找到食物。

The hormone ghrelin, which makes you want to eat, also appears to activate your nose, probably to make it easier to find food.

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Adrenaline is another one, produced by cells in your adrenal gland but used by cells all over your body.

肾上腺素是另一个例子,肾上腺素由肾上腺细胞分泌,但全身各处的细胞都能利用它

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An example is production of certain molecules called cytokines by T-cells that activate themselves.

细胞能分泌这类叫做细胞因子的分子,实现自激活

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