Bertrandite
羟硅铍石
🗣️ 情景例句
Can I help with anything?
我能帮什么忙吗
Off the hook.
放你一马。
Hello. You must be Dr Yang. How do you do? My name's David Lee.
嗨。你一定是杨博士吧。您好！我是大卫·李。