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He replaced a dud valve.是什么意思？

He replaced a dud valve.

他换掉了坏阀门。

相关词汇
he replaced dud valve

he

pron. 他，它，一个人；n. 雄性动物；
例句
Logic had prevailed and he had abandoned the idea.
最终理智占了上风，他打消了那个念头。

replaced

v. 取代( replace的过去式和过去分词 )，更换，把…放回原位，（用…）替换；
例句
The mist had been replaced by a kind of haze that seemed to amplify the heat...
薄雾散了，取而代之的是一种似乎更添酷热的烟霭。

dud

n. [军]哑弹，无用的人或物，衣服，个人物品；adj. 无用的，不完善的；
例句
He replaced a dud valve.
他换掉了坏阀门。

valve

n. 阀，真空管，（管乐器的）活栓，（心脏的）瓣膜；vt. 装阀于，以活门调节；
例句
One of the long-lasting effects of the infection is damage to a valve in the heart...
感染的其中一个长期后果是使心脏瓣膜受损。
热门例句
He acknowledged publicly that he might have made a mistake.
他当众承认自己可能犯了个错误。
...the spiralling vortex airflow that slows the plane.
使飞机减速的螺旋形气流涡旋
You just go on ahead. I'll come by later...
你只管先往前走。我随后就来。
He who spares his rod hates his son, But he who loves him chastens him early.
24不忍用杖打儿子的,是恨恶他;疼爱儿子的, 趁早管教.
For further information, please contact 414 3925, extension 2253.
详情请致电414 3925,转分机2253。
He sat there while I made the case for his dismissal...
他坐在那儿，听我陈述解雇他的理由。
Baroness Thatcher's claims seem credible to many.
撒切尔女男爵的主张在很多人看来是可信的。
Nothing to be got without pains but poverty.
一份耕耘，一份收获。
This decree obliges unions to delay strikes.
该法令迫使工会推迟罢工。
The right to demand payment from the endorser of a commercial paper when the first party liable fails to pay.
追索权当有支付义务的第一方不能支付时，可以向商业票据的背书人要求支付的权力。
相关例句
Ten years later, Dreyfus was rehabilitated...
10年之后，德雷福斯的冤情得以昭雪。
A cellular telephone beeped...
有个手机响了。
It started a fire in a block of flats...
大火是从一幢公寓大楼烧起的。
Across the busy plaza, vendors sell hot dogs and croissant sandwiches.
在热闹广场的另一边，摊贩叫卖着热狗和羊角三明治。
The central bank will provide special loans, and the banks will pledge the land as security.
中央银行会提供特殊贷款，而这些银行会以土地作为抵押。
...a harmonious balance of mind, body, and spirit.
头脑、身体和心灵的协调
A back injury forced her to withdraw from Wimbledon...
背部受伤使她不得不退出温布尔登赛事。
It was good to bounce ideas off another mind...
与别人谈谈自己的想法是有益的。
He was a good friend, a dependable companion.
他是一个很好的朋友，一个可以信赖的伙伴。
I sent him a long fax, saying I didn't need a maid.
我给他发了一份很长的传真，说我不需要女仆。