Cut a round line which disconnected from the bottom by taking diagonal section.

取斜分区，修剪一个斜线条与底部不连接。

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Take diagonal section cut a round graduation technique.

取斜向后分区剪圆形堆积层次。

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Take diagonal section cut a round graduation technique.

取斜向后分区剪圆形堆积层次。

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