Preoxygenation
[医] 预充氧[呼吸]法
🗣️ 情景例句
I hope that he will succeed.
我希望他会成功。
The lion's skin is never cheap.
狮皮从不贱。
it is extremely difficult to estimate the true value of the services which people perform for us.
但要估算别人为我们为所提供的服务的价值却是极其困难的。