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还可用作表语，表示“通常做法”、“常有的事”、“通常情况”：
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It is usual to tip the waiter．给服务员小费是通常做法。
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Heavy traffic is usual at this hour．在这个时刻车辆多是常有的事。
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Is it usual to have milk with meals？吃饭时喝牛奶是通常情况吗？
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此外usual还可和as及than连用：
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As usual, he arrived last．和平常一样，他最后一个到。
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She would go home, as usual, for Christmas．她会像平常一样回家过圣诞节。
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She was feeling a little better than usual．她感到比平时略好一点儿。
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There are more people here than usual．这儿的人比平常还多。
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usually为副词，表示“通常”：
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Influenza usually breaks out in winter．流感通常在冬天开始流行。
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She was usually dressed in black．她通常都穿黑色的衣服。
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Does she usually go to you for advice？她是否通常找你出主意？
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She was usually in good spirits．她通常情绪都是挺好的。
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张道真英语用法（大众珍藏版·第二版） V
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895 variety
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variety可作不可数名词，表示“变换花样”、“多种多样”等：
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I’m for variety．我赞成变换花样。
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We demand more variety for our food．我们要求食品的花样多一点。
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Life at school has plenty of variety．学校的生活有多种多样的内容。
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还可作可数名词，表示“品种”、“种类”：
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There are several varieties of red roses．红玫瑰有好几个品种。
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