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我无法确切说出他是谁。用英语怎么说？

我无法确切说出他是谁。

I am not certain who he is.

相关词汇
am not certain who he is

am

abbr. (=amplitude modulation) <无>调频，调谐；vi. （用于第一人称单数现在时）是；aux. （与v-ing连用构成现在进行时，与v-ed连用构成被动语态）；

not

adv. 不，[用以表示否定、否认、拒绝、禁止等]不是，几乎不，未必，没有[用于否定后面的词或短语]；

certain

adj. 某一，必然的，已确定的；pron. [动词用复数]某些；

who

pron. 谁，什么人，关系代词，有先行词，孰；

he

pron. 他，它，一个人；n. 雄性动物；

is

vt.& vi. 是（be的三单形式；n. 存在；
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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.
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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。
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他所获得的100分是我所见过最好的。
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这种瓷器非常特殊,很难归类。
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这个男孩的牙上有一个洞。
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她看着壮观的瀑布从山坡上倾泻而下。
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把鸡块放到砂锅里。
She stated categorically that she had no intention of leaving.
她明确地说她无意离开。
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小偷迟早会被抓到的。