When this use case is executed according to the Execution case, an execution trace is recorded.

当执行该用例时，记录执行轨迹。

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Firstly, using the contour tracing algorithm to trace the manipulated contour BMP, it has attained the contour point chain recorded by chain Code.

首先，运用轮廓追踪算法追踪经过图象处理后的轮廓位图，形成链符法记录的轮廓点列数据。

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This composite image USES successive pictures recorded during the eclipse from Athens, Greece to trace out a large part of the umbra's curved edge.

这张合成图则是在雅典希腊所拍摄的，拍摄者利用了连续曝光来记录月食，巧妙勾勒出本影的曲线。

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This composite image USES successive pictures recorded during the eclipse from Athens, Greece to trace out a large part of the umbra's curved edge.

这张合成图则是在雅典希腊所拍摄的，拍摄者利用了连续曝光来记录月食，巧妙勾勒出本影的曲线。

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