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So, the next concept that I want to define is that of arc length.
接下来我想介绍一下弧长。
youdao
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The method mostly use of two modes that are time Angle and arc-length.
其方法主要采用两种方式：时角法和弧长法。
youdao
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The method mostly use of two modes that are time Angle and arc-length.
其方法主要采用两种方式：时角法和弧长法。
youdao