名词
中文翻译：所需数量
同义词：
['required quantity', 'minimum quantity', 'necessary amount']
例句：
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1. The number of students in the class is twenty-five.
班级里有二十五名学生。
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2. The manufacturer requires a minimum of three years of experience for this job.
制造商要求这个职位至少需要三年的经验。
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3.The number of people who signed up for the event was fifty.
报名参加该活动的人数是五十人。