名词
中文翻译：Unknown
同义词：
['count', 'quantity', 'magnitude', 'amount', 'multitude']
例句：
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1. Thenumber of students in the class is 30.
班上的学生有30名。
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2.The number of cars on the road has doubled since last year.
路上的汽车数量比去年增加了一倍。
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3. The number of people who have signed up for the event is increasing daily.
报名参加该活动的人数每天都在增加。