危在旦夕的英文：
[Literal Meaning]
danger/at/morning/evening
on the verge of death (destruction)

[解释]
旦夕：早晨和晚上，形容时间短。形容危险就在眼前。

[Explanation]
to be in deadly danger

[例子]
他的生命已经危在旦夕，你还是去医院看看他吧。

[Example]
His life is in deadly danger and you'd better go to the hospital to have a look.

[英文等价词]
at death's door
on a razor's edge

Hang on by the eyelids
事情危在旦夕

The patient was on the verge of death.
病人危在旦夕。

The sick man hovered between life and death
那个病人危在旦夕。

The days of the patient are numBered.
这种病人的生命危在旦夕。

The days of the patient are numbered.
这个病人危在旦夕。

The girl's life was obviously in immediate danger.
"很明显,这女孩的生命危在旦夕。"

"Without urgent help, the country's days are numbered."
若无紧急援助,图瓦卢将危在旦夕。

They were very distressed to hear that their beloved uncle was at death's door.
得知他们爱戴的伯父生命危在旦夕,他们很悲伤。

The arrogance spells danger and may signal the beginning of a crisis.
自大便是危机的开端，此时国家将危在旦夕。