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I am not certain who he is.是什么意思？

I am not certain who he is.

我无法确切说出他是谁。

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。
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
He lifted a lot of things from the supermarket.
他在超市偷了许多东西。
You must do everything carefully.
你必须仔细地做每一件事。
He put forward a baffling question.
他提出了一个难题。
12-karat gold
十二开金
No one knows more about it than myself.
关于这件事没有一个人比我知道得更多。
The jump was a very difficult one.
这种跳是非常困难的一种。
the uneconomic circumstances of townshiop enterprises
企业的外部不经济性
The new ambassador is more mature than his predecessor.
新大使比他的前任更成熟一些。
I’ll give my room a good turnout.
我要好好清扫一下房间。
He is a ready writer.
他是一位才思敏捷的作家。