Diboride
二硼化物
🗣️ 情景例句
Are you all right?
你怎么了？
I asked him to fix it for me, but he wouldn't.
我请他帮我修理，但是他不肯。
Good morning, Mr. Zhang. I'm sorry to trouble you.
早上好，张先生。很抱歉打扰您。