Orcin
n. [化]苔黑素,苔黑酚
🗣️ 情景例句
I'm glad our negotiation has come to a successful conclusion.
我很高兴这次洽谈圆满成功。
How long have you studied English?
你学英语多久了？
Was he absent from school last week?
上星期他没上学吧？