horizontal line on a plane 平面上的水平线
The bright horizontal line running the full length of the image is the galaxy's main disc - the plane in which the Sun and the Earth also reside.
贯穿整张图片的明亮水平线是银河系的主盘，太阳和地球就处于其中。
The Angle between a linear feature and a horizontal line in a vertical plane containing both lines.
一个直立的平面内介于一线性特征与一条水平线之间的角度。
The projecting lines are discussed by using the line of intersection in horizontal ( H ) plane, profile ( W ) plane and frontal ( V ) plane.
并讨论相贯线在水平（H）面，侧立（W）面，正立（V）面上的投影线。
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