1.
I often suffer from unaccountable headaches.

我常莫名其妙地头疼。
2.
It was my ace, for God's sake!

莫名其妙,那是我的老A!
3.
Her conduct is a mystery to me.

她的行为使我莫名其妙。
4.
It's all very puzzling.

这都很使人莫名其妙。
5.
Your attitude gets me.

你的态度令我莫名其妙。
6.
Dive off the deep end

突然莫名其妙地发怒
7.
He felt absurdly happy.

他觉得莫名其妙地快乐。
8.
Collins seemed confused.

柯林斯有点莫名其妙。
9.
There's neither rhyme nor reason in his behaviour.

他的举动莫名其妙.
10.
She got angry without rhyme or reasson.

她莫名其妙地生起气来。
11.
His explanation is very obscure to me.

他的解释使我莫名其妙。
12.
She had been merry without reason, and sad without reason.

她忽而莫名其妙地高兴,忽而莫名其妙地发愁。
13.
perceptible only as unaccountable influences that hinder progress; an unexplainable fear.

只能察觉到一些阻碍发展的莫名其妙的影响;莫名其妙的恐惧。
14.
Unintelligible or nonsensical talk or writing.

莫名其妙的话莫名其妙的或毫无意义的话或写作
15.
There were a number of aspects that did not make sense.

有许多方面使人莫名其妙。
16.
I was just wondering about that myself.

我就是觉得这件事莫名其妙.
17.
They were puzzled by the move (with the question).

这一行动(问题)使他们感到莫名其妙。
18.
He felt an unreasonable catch of fear.

他莫名其妙地感到一阵心寒。