...tion plane）,其中一个是正立投影面（vertical projection plane）用V表示，另一个是水平投影面（horizontal projection plane）用H表示，V面和H面组成两投影面体系。两投影面的交线为投影轴（projection axis）用OX表示。
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On the horizontal projection plane, an included Angle is formed between the thrusting bars and the longitudinal center line of the axle.
在水平投影面上，推力杆与车架纵向中心线之间具有夹角。
That means I want maybe to look at the projection of this guy onto a horizontal plane.
那就意味着，我可能想看到，这个在水平面上的投影。
This paper provides a new construction method used when the horizontal projection of the plane Angle is equal to its space Angle.
本文提出平面角的水平投影与其空间角相等时新的作图方法。
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