蝶形单元是由两个全等的三角形组成。

Butterfly Mechanism consists of two congruent equilateral triangles.

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你可以使用初等的几何知识例如三角形的三个内角各为180度和三角形全等的规则(边-角-边等)。

You may only use elementary geometry, such as the fact that the angles of a triangle add up to 180 degrees and the basic congruent triangle rules (side-angle-side, etc.).

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临时建设影响近期建设规划或者控制性详细规划的实施以及交通、市容、安全等的，不得批准。

If temporary construction affects the implementation of the short-term construction plan or the detailed control plan, traffic, the appearance or safety of a city, etc., no approval may be granted.

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