Emodin, they found, when they tested it on frogspawn, kills embryonic frogs.

他们在对蛙卵的实验中发现，大黄素可以杀死胚胎期的青蛙。

Its leaves are full of a toxin called emodin that discourages browsers.

它的叶子充满了一种名为大黄素的毒素，使得食草动物望而却步。