名词
中文翻译：数字
同义词：
['quantity', 'quantity of', 'number of']
例句：
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1.The teacher asked us to count the number of books on the shelf.
老师让我们数书架上的书的数量。
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2.The computer has a built-in calculator that can perform basic mathematical operations.
这台电脑内置了一个计算器，可以进行基本的数学运算。
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3. We need to keep track of the number of people who have signed up for the event.
我们需要记录有多少人报名参加了这个活动。