Hydroxytryptamine
n. 含于血液中的复合胺
🗣️ 情景例句
It's a great college.
那是一所好大学。
Let me do some research on this and get back with you tomorrow.
请让我查查看，明天再给你答复。
He told him he had better return it or he would call the police.
告诉他最好把羊交还，否则就去叫警察。