All potatoes contain two natural toxins called solanine and chaconine.

所有土豆都含有两种天然毒， 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.

土豆皮上的绿色实际上叶绿，无毒的，但这表明了有毒茄碱的存在，这一种防御害虫的机制。