Preoxygenation
[医] 预充氧[呼吸]法
🗣️ 情景例句
This is Gao Qiang in Room 409.
我是409房间的高强。
I am sorry to keep you waiting.
真抱歉，让你久等了。
Excuse me. Is there a post office near here?
请问，附近有邮局吗？