The projection plane may be the basic projection plane, newly-established vertical plane or common place plane, and the direction of the projection may slope.
投影面可为基本投影面也可为新设的垂直面或一般位置平面。
The projection plane may be the basic projection plane, newly-established vertical plane or common place plane, and the direction of the projection may slope.
投影面可为基本投影面也可为新设的垂直面或一般位置平面。
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