must
modal verb ukstrong /mʌst/ weak /məst/ weak /məs/ usstrong /mʌst/ weak /məst/ weak /məs/
(NECESSARY)
A2 必须
used to show that it is necessary or very important that something happens in the present or future
Meat must be cooked thoroughly. 肉必须完全煮熟。
I must get some sleep. 我必须睡会儿觉了。
You mustn't show this letter to anyone else. 你不许把这封信给其他人看。
Luggage must not be left unattended (= it is against the rules). 行李不能无人看管。
formal Must you leave so soon? 你非得走这么早吗？
formal "Must I sign this?" "Yes, you must." “我必须在这上面签字吗？”“是的，必须。”
一定要，坚持要
If you say that you must do something, you mean that you strongly intend to do something in the future.
I must phone my sister. 我一定要给我妹妹打个电话。
We must get someone to fix that wheel. 我们一定要找人修修那个轮子。
UK I mustn't bite my nails. 我一定不咬指甲了。
（表示强调）必须
used for emphasis
I must say, you look absolutely great. 我得说，你看上去好极了。
I must admit, I wasn't looking forward to it. 我必须承认，我并不是很期待这件事情。
B1 务必，一定要
If you tell someone else that they must do something pleasant, you are emphasizing that you think it is a good idea to do that.
You must come and stay with us one weekend. 你一定要来和我们一起度周末。
We must meet for lunch soon. 我们一定要快快找个日子相约吃个午饭。
- More examples
- I must do some ironing tonight.
- Food must be heated to a high temperature to kill harmful bacteria.
- You must give the bank a written notification if you wish to close your account.
- Soldiers must obey orders.
- Candidates must answer two questions from each paper.
(PROBABLY)
B2 想必;一定
used to show that something is very likely, probable, or certain to be true
Harry's been driving all day - he must be tired. 哈里开了一天车，他一定累了。
There's no food left - we must have eaten it all. 没剩什么食物了，想必我们全吃光了。
When you got lost in the forest you must have been very frightened. 那天你在森林里迷路了，一定很害怕吧。
"You must know Frank." "No, I don't." “你一定认识弗兰克。”“不，我不认识。”
- More examples
- There must be a phone directory in the office somewhere.
- There's water on the floor - we must have a leak.
- Try to imagine what life must have been like for Neolithic man 10,000 years ago.
- The letter must have gone astray in the post.
- Why am I under arrest? There must be some mistake.
must
noun [ C ] informal ukstrong /mʌst/ weak /məst/ weak /məs/ usstrong /mʌst/ weak /məst/ weak /məs/
必不可少的事物
something that is necessary
If you live in the country a car is a must. 如果你住在乡下，汽车是必不可少的。