数词
中文翻译：七
同义词：
['seven', 'seventeen', 'twenty-seven']
例句：
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1. The number of students in the class is seven.
班级里的学生有七人。
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2. I have two tickets for the concert, so there are seven of us.
我有两张音乐会的票，所以我们有七个人。
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3. She counted out seven quarters to pay for the meal.
她数出七枚五分硬币来支付餐费。