Backsiphonage
反虹吸
🗣️ 情景例句
Please come in, Mr. Wilson.
请进，威尔逊先生。
Oh, I'm very sorry, sir.
噢，我实在抱歉。
They also have fish and chip shops in Australia, but there are not so many in the USA.
澳大利亚也有炸鱼和土豆片，而在美国却没有那么多。