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	tailrace tunnel tail race tunnel tail radius of crane tail rake tail recursion tail recursion elimination tail region tail resistors tail reversing inductance tail rod tail rod catcher tail-rod guide tail roll tail roller tail rolls tail rope tail-rope system tail-rot disease tail rotor tail section heater tail section heating gas distribution console tail section heating line system tail series tail setover tail shaft

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