这个平行四边形仍然有相同的面积，它仍然在同一个平面上。
The parallelogram still has the same area, and it's still on the same plane.
然而有时，所有平面都与同一个方向平行。
However, sometimes it will happen that all the planes are parallel to the same direction.
此外，桨叶的平面与支柱平行。
In addition, the plane of the blades is parallel to the pole.
按照定义，平行线是在同一平面上永不相交的线。
Parallel lines are, by definition, lines on the same plane that never join.
用途：对精密零部件的平行、平面测量。
用途：对精密零部件的平行、平面高精度测量。
Use: Parallel, level hight-accuracy measurement to the accurate spare part.
它是过射影中心且平行于象平面的平面。
It is the plane through the center of projection parallel to the image plane.
在横机上，针在一个平面上平行排列。
In these the needles are arranged parallel to each other in a flat plane.
基准线平行，在地平面或者基准平面上。
A line of punch positions parallel to the Y datum line of a punch card.
基准线平行，在地平面或者基准平面上。
A line of punch positions parallel to the Y datum line of a punch card.
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