must

名词 must:

1. a necessary or essential thing
2. grape juice before or during fermentation
3. the quality of smelling or tasting old or stale or mouldy
   同义词：mustiness, moldiness

形容词 must:

1. highly recommended

1. Something must be done about it.
   必须得想个办法。
2. His new novel is a must for all lovers of crime fiction.
   他的新小说是罪案小说爱好者必须一读的。
3. In England traffic must keep to the left.
   在英国，车辆必须靠左行驶。
4. Her beauty-salon was always full and she must have made a bomb thereby.
   她的美容院总是客满，因此她一定挣了大笔的钱。
5. The girl was back in a pig's whisper. She must have run all the way.
   那个女孩一会儿就回来了。她肯定是跑着去跑着回的。

must

v.aux.（助动词）
To be obliged or required by morality, law, or custom:
必须：为道德良心、法律或者习惯所要求或强迫：
例句：
Citizens must register in order to vote.
为了进行选举，公民们必须登记

To be compelled, as by a physical necessity or requirement:
必须，必要：由于物质需要和要求而被迫：
例句：
Plants must have oxygen in order to live.
为了存活植物必须有氧气

Used to express a command or an admonition:
一定，必须：用来表示命令或者愿望：
例句：
You must not go there alone. You simply must be careful.
你一定不要单独去那里。你一定要小心

To be determined to; have as a fixed resolve:
一定：下决心一定要；坚持要：
例句：
If you must leave, do it quietly.
如果你一定要离开，那就悄悄地走

Used to indicate inevitability or certainty:
表示不可避免性或者可能性：
例句：
We all must die.
我们都会死

Used to indicate logical probability or presumptive certainty:
可能：用来表示逻辑推断的可能性或假定的必然性：
例句：
If the lights were on, they must have been at home.
如果灯亮着，那么他们一定在家

v.intr.Archaic （不及物动词）【古语】
To be required or obliged to go:
被要求或被迫去：
例句：
.I must from hence.(Shakespeare)
.我必须从这里走.(莎士比亚)

n.（名词）
Something that is absolutely required or indispensable:
一定，绝对：绝对必要或不可避免的应当去做之事：
例句：
Promptness on the job is a must. Comfortable shoes are a must when taking a walking tour of Wales.
工作上准时是绝对必要的。步行去威尔士旅行时舒服的鞋是绝对必要的物品

n.attributive.（定语名词）
Often used to modify another noun:
常用来修饰另一个名词：
例句：
a new book that is must reading; a list of must legislation for the session.
一本不可不读的新书；开庭不可缺少的立法一览表

来源：
Middle English moste
中古英语 moste
from Old English môste [past tense of] môtan [to be allowed] * see med-
源自 古英语 môste [] môtan的过去时 [被允许] *参见 med-

must
must 2

n.（名词）
The quality or condition of being stale or musty.
发霉：陈腐或者发霉的特性或状态

来源：
Probably back-formation from musty
可能源自 musty的逆成词

must
must 3

n.（名词）
The unfermented or fermenting juice expressed from fruit, especially grapes.
果汁：从水果中压出的发酵或者未发酵的果汁，特别是从葡萄中挤出的

来源：
Middle English
中古英语
from Old English
源自 古英语
from Latin mustum [neuter of] mustus [new, fresh]
源自 拉丁语 mustum [] mustus的中性 [新的，新鲜的]

must
must 4

n.（名词）
Variant of musth
musth的变体

must
must 5

n.（名词）
Musk.
麝香

来源：
Scottish
苏格兰语
from Old French
源自 古法语
variant of musc * see musk
musc的变体 *参见 musk