名词
中文翻译：变量
同义词：
['variation', 'variable factor', 'variable quantity']
例句：
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1. The temperature is a variable that affects the outcome of the experiment.
温度是一个可变因素，影响实验的结果。
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2.The amount of sunlight that reaches the earth's surface varies greatly from place to place.
到达地球表面的阳光量在各地有很大的差异。
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3. The rate at which the population grows is a variable that can be influenced by various factors.
人口增长的速度是一个可变因素，受到各种因素的影响。