词典释义：
be obliged to; should (expressing necessity)
［表示必要］ 必须
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I must go 我必须去
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it mustn't be over 2,000 words 字数不得超过２，０００
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she said she must be going .她说她必须要走了。
expressing insistence
［表示坚持］ 一定
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you must try some of this fish 这鱼你一定要尝一点儿
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if you must smoke you could at least go in the living room .如果你一定要抽烟的话，至少你可以到客厅里去。
used in ironic questions expressing irritation
［用 于具有讽刺意味的问句中表示恼怒］ 一定要，非要
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Charlotte, must you put spanners in the works? 夏洛特，难道你非捣乱不可吗？
expressing an opinion about something that is logically very likely
［表 示合乎逻辑的推断］ 一定，想必
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there must be something wrong 一定是出了什么差错了
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you must be tired .你一定是累了。
〈非 正式〉 不该忽视（或不可错过）的东西；必备之物
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this video is a must for everyone .这录像每一个人都该看看。
grape juice before or during fermentation
（发酵前或发酵中的）葡萄汁。
mustiness, dampness, or mould
发霉；潮气；霉菌
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a pervasive smell of must .四处弥漫的霉味。
the frenzied state of certain male animals, especially elephants or camels, that is associated with the rutting season
（尤指发情期的公象、雄骆驼等的）狂暴状态
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a big old bull elephant in must 处于发情期狂暴状态的大老公象
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[as modifier]
the must gland .处于发情期狂暴状态的腺体。
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I must say 见SAY .must needs do something 见NEEDS .
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must have done sth 想必/准是做了...
真题例句：
"Old English
