All potatoes contain two natural toxins called solanine and chaconine.

所有土豆都有种天然毒素， 称为龙葵碱和茄碱。

The green color that forms on the skin is actually chlorophyll which isn't toxic but indicates the presence of the toxin solanine which is a defense mechanism against pests.

土豆皮的绿色是叶绿素，它是无毒的，但这表明了有毒素茄碱的存在，这是一种防御害虫的机制。