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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）；
例句
I am so pleased to make your acquaintance, Mr Tweed.
很高兴认识您，特威德先生。

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]；
例句
It became very clear that the incident was not just an aberration, it was not just a single incident.
事实已经很清楚，这件事不是偶发的，它并不是一起孤立的事件。

certain

adj. 某一，必然的，已确定的；pron. [动词用复数]某些；
例句
Paramedics are trained to administer certain drugs.
护理人员们接受了配发某些药物的培训。

who

pron. 谁，什么人，关系代词，有先行词，孰；
例句
The last French king was Louis Philippe, who abdicated in 1848.
法国末代国王是1848年逊位的路易·菲力普。

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。

is

vt.& vi. 是（be的三单形式；n. 存在；
例句
Bollinger 'RD' is a rare, highly prized wine.
博林格RD香槟是一种名贵的备受推崇的葡萄酒。
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
It took him several years to work off the loan he owed us.
他花了好几年的时间才逐渐还清欠我们的债务。
reflective glass
反光镜
There are various ways to solve the problem.
解决这个问题有许多种方法。
the continuous drone of the engine
发动机连续不断的嗡嗡声
My attention was riveted by a slight movement in the bushes.
我的注意力被灌木丛中的轻微晃动吸引住了。
As the dress fits badly, I shall pick it to pieces and remake it.
这件衣服不合身，我要把它拆了，重新做。
The pianist played several pieces of music on a grand piano.
钢琴家在一架大钢琴上弹了几首乐曲。
His whole life is dedicated to scientific research.
他毕生致力于科学研究。
Many of the prisoners were roughly handled; some were killed.
很多囚犯受到了粗暴的对待；有些甚至被整死了。
He is somewhat embarrassed.
他稍微有点窘迫。