Definition
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must
The word 'must' is used to express obligation or necessity.
词汇 'must' 用于表示义务或必要性。
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You must finish your homework before going out.
你必须在出去之前完成作业。
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He must wear a helmet while riding a bike.
他骑自行车时必须戴头盔。
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We must arrive on time for the meeting.
我们必须准时到达会议。