... angle of rotation 旋转角 angle of the sector 扇形角 angle sum of a triangle 三角形内角和 ...
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探讨合理的结构方案和合理的材料选择，（3） 对磁鉄的扇形角加工提出了简易方法。
Some considerations about the construction version and choice of materials for the magnet; (3) A simple method of sector-angle machining.
如下图所示，他的方法不是仅仅针对一车的人，而是走之字形策略，从一角开始，所牵涉的人成扇形散布开来。
Instead of tending to just one bus, he zigs and zags through the diagram, fanning out from the corner as shown below.
配上不同的颜色玻璃和不同的发散透镜，可获得各种颜色、各种发散角的扇形光束。
Sector beams in different colors and with different angles of divergence are available when equipped with different color and divergent lenses.
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