So an easy thing to do in planar geometry is I want to make a line segment.
在平面几何里比较容易的一件事,就是做一个线段。
Ok, double line. If there are no questions I'm going to make a dramatic change in topic.
好的,这是重点,如果没什么问题,我要讲下面的内容。
I think this will make it a little easier for us, just line up next to each other.
我想这会让事情更简单些,大家排排站
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