must
must 1
AHD:[m¾st]
D.J.[mJst]
K.K.[mJst]
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：
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：
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：
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：
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：
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：
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：
“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：
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：
a new book that is must reading; a list of must legislation for the session.
一
