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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。
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。
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。
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
There's a bolt on the door.
门上有把闩。
They are studying what to do next Sunday.
他们在研究下星期日做什么。
If you drive too fast, the police will pull you up.
如果你开得太快, 警察就要把你拦住。
Our offer was met with a firm refusal.
我们的报价被坚决拒绝。
Don’t tell Ma or Pa.
不要告诉妈,也别告诉爸。
a rather dumpy, unprepossessing servant
相当矮胖，不讨人喜欢的仆人
These sets of machines were out of date.
这几套机器过时了。
He often tells stories full of mystery.
他常讲些充满神秘色彩的故事。
The rumour is that there is a sequel to the movie in the works, although this has not been confirmed.
传言说正在计划拍摄这部电影的续集,但并未得到证实。
It's silly to get out in the rain if you don't have to.
除非万不得已, 跑到外面淋雨就是愚蠢。