Thrombotonin
5-羟色胺
🗣️ 情景例句
And here he is--Popo the Clown.
这位就是小丑Popo。
It is convenient to know the language.
掌握这门语言会带来方便。
Look at his big teeth. Isn't he bigger than you?
瞧他的大牙齿。他的块头不是比你大吗？