Lifeguarding
(lifeguard 的现在分词) n. 卫兵, 禁卫军, 救生员
🗣️ 情景例句
Save your voices.
留着点嗓子。
Don't you think we should add a sentence here like this?
难道你不觉得我们应该在这儿加上一句话？
The airport was built years ago, but for some reason it could not be used then.
机场是许多年前建的，但由于某种原因当时未能启用。