bump into 是无意的而knock down是有意的楼上那个,敲进是knock at 吧============================knock into 撞上(某人)examples:i knocked into an old friend of mine in the park.我昨天在公园里碰见一位老朋友。the boy knocked into her.那个男孩撞到了她身上。============================bump into 巧遇,不期而遇examples:the bus bumped into the back of the car.公共汽车砰的一声撞上了一辆汽车的后部。i really am so sorry to bump into you.撞着你了真是非常抱歉。============================两个意思非常相近,非要区分,主要由knock和bump的本意来区分:knock强调“敲”bump强调“碰”knock [n?k] n. 敲,敲打,敲门v. 敲击,互撞,攻击bump [b?mp]vi.(against)碰;颠簸着前进 n.碰撞=======================其实没什么差别我个人认为knock into一般用来表示撞上某人bump into sb不期而遇;偶然碰见;邂逅knock down打[撞]倒; 驳倒 ,拆除, 拆开
7,knock down 是什么意思啊
knock down
〈非正〉击倒, 撞倒
He knocked his opponent down with one blow in the competition.
比赛中他一拳就打倒了他的对手。
拆卸
The portable device easily knocks down.
这种轻便装置容易拆卸。
〈非正〉降价; 减少
The man was asking £5 for the dress, but I knocked it down to £4.50.
那件衣服卖主索价5英镑, 但我砍价后以4.5英镑买下了。
卖时以击锤表示卖出
The auctioneer knocked the bureau down to a furniture dealer from York.
拍卖者将写字台卖给从约克来的家具商。
〈俚〉挣得, 获得过
A clever lawyer can knock down 40, 000 dollars in a good year.
如果碰上好运气, 一个精明的律师一年就能赚四万美元。
〈俚〉偷; 抢
He wanted to knock down a bank.
他想抢劫银行。
使降低; 使丢脸
She does not want to knock down his self-esteem.
她不想挫他的自尊。
拒绝
They knocked down the suggestion.
他们把这条建议否决了。
挥霍
She knocked down forty dollars at a restaurant.
她在一家饭馆花掉40美元。
在燃烧区域边缘控制〔减弱〕火焰〔高温〕
There was a low protecting wall to knock down the heat blasting from the pit of the furnace.
有一堵低矮的护壁挡住从炉膛里喷出的火焰。