Command: MIRROR
Select objects: Specify opposite corner: 1 found
Select objects: Specify first point of mirror line: mtp --->采用mtp捕捉方式
First point of mid: --平行线上的一点
Second point of mid: -另一条平行线上的点
Specify second point of mirror line: <Ortho on>
Erase source objects? [Yes/No] <N>:
Command: <Osnap off>