Clappet
[建] 止回閥
??? 情景例句
If you flatter your mother a bit she might invite us all to dinner.
你如果多奉承你母親幾句話，說不定她會把我們全部請去吃飯。
My wife and I still remember the first day we arrived in Beijing.
我太太和我仍然記得到北京的第一天。
The eggs are sold by the dozen.
雞蛋按打賣。