名词短语
中文翻译：复数的复数
同义词：
['multiplying', 'multiplying of', 'multiplicating', 'multiplying with']
例句：
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1. The function is defined by the equation x^2 + y^2 = z^2.
这个函数由方程x^2 + y^2 = z^2定义。
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2. The product of three numbers is the sum of their squares.
三个数的乘积是它们的平方和。
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3.The number of students in the class is double that of the previous year.
班上学生的数量是去年的两倍。