名词
中文翻译：四倍
同义词：
['quadruped', 'quadrupedal']
例句：
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1.The number of students in the class is four times that of last year.
班上学生人数是去年的四倍。
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2. The teacher asked us to work in groups of four.
老师要求我们以四人一组的方式工作。
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3.The company has doubled its workforce in the past five years.
该公司在过去五年里员工数量增加了一倍。