Cystathionine
n. [生化]胱硫醚,丙氨酸丁氨酸硫醚
??? 情景例句
Let me help.
我來幫忙。
I asked him to go to the store, but he wouldn't
我請他去商店，但是他不肯。
I'm a director. I direct plays.
我是導演。我導演戲劇。