名词
中文翻译：比例常数
同义词：
['proportional constant', 'proportionality constant']
例句：
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1. The relationship between the two variables is proportionality constant.
这两个变量之间的关系是比例常数。
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2. The proportion of students who failed to pass the exam was proportionality constant.
未能通过考试的学生比例是比例常数。
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3. The proportionality constant in this equation is 2.
这个方程中的比例常数是2。