它们只是刺激并激活我们的免疫系统工作，告诉它有害的东西来了。
They only stimulate and activate our immune system to work, telling it something harmful is coming in.
它的原理在于：当植物蛋白受体受到有害化学物质的刺激时，叶面外皮会释放出一种萜类化合物用以覆盖叶面，因此植物会改变其颜色。
It works because the receptor proteins in plant DNA respond naturally to threatening stimuli by releasing chemicals called terpenoids to thicken the leaf cuticle, thereby changing its colour.
我们开始议论食物中的‘环境毒物’，开始意识到一不留神就有可能拿到一袋有害健康的薯片，把刺激物从环境中移开不失为一条好计策。
We are starting to talk about 'toxic environments' with food and to understand how easy it is to mindlessly reach for a bag of potato chips.
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