英语词汇“knock at”的读音、翻译、释义、用法及例句-开邑网

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	spill over spillover spillover dalt spill-over echo spill over effect spillover effect spillover efficiency spillover pool spillover position spillover power spillover radiation spill overs spill-over signal spillover valve spillover zone spill pipe spill pit spillplate spill point spill pore spill port spill prevention spill process spill salt spill sand

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