Clappet
[建] 止回阀
🗣️ 情景例句
Where's my cap and gown?
我的帽子和长袍在哪里？
When is the most convenient time for you?
你在什么时间最方便呢？
Everyone knows that if he shouts in the vicinity of a wall or a mountainside, an echo will come back.
大家都知道，在墙壁或山腰附近发出的喊声，就会听到回声。