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他不由自主地笑了一下。用英语怎么说？

他不由自主地笑了一下。

He gave an involuntary smile.

相关词汇
he gave an involuntary smile

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。

gave

v. 给予，赠送( give的过去式 )，（与名词连用描述某一动作，意义与该名词相应的动词相同），供给，交给；
例句
He gave a detailed account of what happened on the fateful night...
他详细描述了那个灾难性夜晚所发生的事。

an

art. 一（在元音字母前代替不定代词a），一任一某一，一个；
例句
He started eating an apple...
他开始吃苹果。

involuntary

adj. 无意识做出的，非故意的，非自愿的，不随意的，不由自主的；
例句
Another surge of pain in my ankle caused me to give an involuntary shudder.
脚踝突然又一阵疼痛，痛得我直打哆嗦。

smile

n. 微笑，笑容；vt. 以微笑表示，以微笑完成；vi. 微笑，赞许，不在乎；
例句
He answered her smile with one of his own...
他对她的微笑回以同礼。
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。
This decree obliges unions to delay strikes.
该法令迫使工会推迟罢工。
Nothing to be got without pains but poverty.
一份耕耘，一份收获。
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。
Supporters of the death penalty argue that it would deter criminals from carrying guns...
死刑的支持者认为它能阻吓罪犯携带枪支。
相关例句
The post served as a bound-ary marker.
这个哨站用作标界。
He braced himself to meet the blow.
他振作精神去承受这个打击。
I've got a bad cold.
我得了重感冒。
Three celebrated tenors sang at the president’s inauguration.
3位著名的男高音歌手在总统就职仪式上演唱。
Two days later he was gone.
两天后他就不在了。
She poured a bucket of water over me.
她把一桶水倒在我身上。
The horses galloped towards the post.
马飞快地冲向终点。
I am so glad that you have come.
对你的到来我感到很高兴。
The noun “mouse” is the singular form of “mice”.
名词mouse是mice的单数形式。
They all seem to take an inflated view of their collective identity.
他们对自己的集体身份似乎都持有一种夸大的看法。