Clappet (valve)
[化] 止回阀
🧩 词语组成解析
[建] 止回阀
🗣️ 情景例句
Don't be such a grouch.
不要总是牢骚满腹。
He is attending a morning intensive course four hours a day, six days a week.
他每周六早晨都上一门4小时的速成课。
Those flowers are lovely, too.
这些花也很漂亮啊。