| 释义 |
knock MAKE NOISEHnBk, $nB:kv [I]to repeatedly hit (something), producing a noise敲;击Jane knocked on the window to attract his attention.简敲敲窗想引起他的注意。He knocked on/at the door and called out, "Is anyone at home?"他敲门叫道： “家里有人吗？”"Knock, knock!" is a way of describing the sound made when you hit a door. It is often used as the first line of a joke.“笃笃！”（敲门声，常用于开玩笑）"Knock, knock!" "Who's there?" "Boo""Boo who?" "There's no need to cry--it's only a joke. "“笃笃！”“是谁？”“嘘！”“嘘谁？”“用不着喊----不过开个玩笑。”The noise of a rope knocking against the side of the ship woke him up.绳子敲打船舷的声音把他吵醒了(specialized) If an engine is knocking, it is producing a repeated high sound either because the fuel is not burning correctly or because a small part is damaged and is therefore allowing another part to move in ways that it should not.（发动机）发爆震声If something such as a pipe knocks, it makes a repeated high sound.(机器等)发碰撞声We must get the plumber in-- the central heating is knocking again.我们得去请管道工了----中央暖气又嘭嘭作响了。If you say that someone's knees are knocking, you mean that they are so frightened that their legs are shaking.害怕得膝盖打颤(infml) If someone or something is knocking on a particular age or number, they have almost reached it.几乎到达（某个年龄或数字）She was knocking on 80 when she died.她死时快80岁了。Knock on wood or knock wood is Am and Aus for touch wood.（作引火物用的）朽木;火绒 [TOUCH ]If someone is knock-kneed, their knees bend towards each other.膝外翻的
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