单词：chain line
chain line的用法和样例：
例句
- Look, under the square wheel, there is a curved line, which is called catenary in mathematics.你看，方轮下面的路线是一条曲线，这条曲线在数学上是一条悬链线。
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Line In.... Line Down Line in... line down... line in* Line in... line down... line in... line down Line in... line down... line in... line down Line in and save me Myself can drug me down Line in, forever blissful Continue to line down Line in... li
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