Plane is the mechanical base of geometrical accuracy and a lot of references such as plate, level and square, etc. are evolved from the plane.

几何精度的机械技术基础是平面，由平面可演变出基准平尺、平板、方尺等精度基准。

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This paper discussed the existing teaching problems in mechanical base experiments and put forward a basic thought of teaching reform on mechanical base experiments.

论述目前机械基础系列课程实验教学中长期存在的问题。

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The study of the mechanical properties of cement concrete pavements is the base of the structural design of pavement.

水泥混凝土路面的力学性能分析是路面结构设计的基本依据。

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Yet the Republican National Committee and Romney, a mechanical campaigner whose ability to inspire passion in the Republican base was widely questioned during the primaries, hold a huge cash advantage over Obama.

NEWYORKER: Super-Rich Irony