If there is a gap in a segment, draw an imaginary line to close it.

如果段中存在间隙，则绘制一条假想线来使它封闭。

youdao

If there is a gap in a segment, draw an imaginary line to close it.

如果段中存在间隙，则绘制一条假想线来使它封闭。

youdao