Celmide
二溴乙烷
🗣️ 情景例句
First, we need to more public relations activities to promote understanding.
首先，我们应该更多地做公关活动以促进了解。
How's your niece?
你的侄儿好吗？
We're going to leave at about seven thirty next Monday morning.
我们打算下星期一早上7：30 左右出发。