名词
中文翻译：主曲线
同义词：
['major curve', 'principal axis例句：1. The principal curve ofthe planet is its orbit around the sun.（行星的主要曲线是围绕太阳的轨道。）']
例句：
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1. The principal curve ofthe planet is its orbit around the sun.
行星的主要曲线是围绕太阳的轨道。
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2.The principal curve in this equation represents therate of change of the dependent variable withrespect to the independent variable.
这个方程中的主要曲线代表了自变量相对于因变量的变化率。
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3. The principal curve of the graphshows the relationship between the two variables.
图形的主要曲线显示了两个变量之间的关系。