0 used with another verb to express need -- phải
We must go to the shops to get milk.
1 used, usually with another verb, to suggest a probability -- cần
2 used, usually with another verb, to express duty, an order, rule etc -- cần thiết
3 something necessary, essential, or not to be missed -- chắc hẳn
You mustn't confuse the problem with the way in which the problem will be resolved.
The top of the cooker mustn't look dirty, whatever happens.
I mustn't prejudice my relationship with my minister beyond refusing to accept a ban on internal discussions within the department.
You mustn't, not with a complaint like he's got (wife, no diagnosis ; husband with dementia).
We mustn't endorse technology for its own sake, nor simply for its economic potential, but ask what its ends are.
In fact, one mustn't do it, not like that; one couldn't go on.
You mustn't allow enough time for the mind to think of an alternative.
Just because there are dark fogs which our sun hasn't yet penetrated we mustn't let the sun lose its glare.
中文繁体
必要的, 必須, 一定要，堅持要…
More中文简体
必要的, 必须, 一定要，坚持要…
MoreEspañol
deber, tener que, deber de…
MorePortuguês
dever, ter que…
More日本語
～しなければならない, 是非～するべきだ, ～にちがいない…
MoreTürk dili
gereklilik/zorunluluk bildiren yardımcı fiil, ...malı/meli, güçlü olasılık bildirir…
MoreFrançais
dois/doit/devons/devez/doivent, il faut que, devoir…
MoreCatalan
haver de, deure…
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