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。
So, the usual notation that we will have is for arc length.
通常我们用符号s来表示弧长。
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。
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。
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