Echinine
[化] 叔异戊烯色氨酸
🗣️ 情景例句
No, thanks.
不用了， 谢谢。
You're very kind to take the trouble to help me.
谢谢你不怕麻烦帮助我。
Oh! Well, for that, you'd better find an English pen friend.
哦！那你最好为此找一个英文的笔友。