英语词汇“knock at”的读音、翻译、释义、用法及例句-智慧网

词汇	knock at
释义	knock atknock at1.■打, 捶, 敲He went upstairs and knocked at the door.他上楼敲门。Opportunity knocks at the door only once.机不可失, 时不再来。
随便看	vortex method vortex microporous oxygenator vortex mill vortex motion vortex of heart vortex pair vortex path vortex pattern vortex plane vortex plane rolling-up vortex point vortex precession flowmeter vortex precombustion chamber vortex pump vortex rain vortex reactor vortex ring vortex-ring cascade vortex roll vortex row vortex sensor vortex separation vortex shedding vortex shedding effect vortex shedding flowmeter

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