因此我使x等于一个常数，那就是说,用一个平行于黑板的平面来进行切割。
OK, so I fix x equals constant. That means that I slice by a plane that's parallel to the blackboard.
这一计划在一个平行四边形内设计，直接面对南北向的多余线条切割了场地东西边沿。
The plan was designed in a parallelogram, cutting the site's east and west edges with additional lines that confronts directly to the south-north direction.
由几个平行的刀片进行同时切割的动力锯。
A power saw that has several parallel blades making simultaneous cuts.
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