这些镶嵌的空间切片的跨度相当于一个满月直径的三分之一(10弧分)。

This Mosaic spans a slice of space that is equal to about a third of the diameter of the full moon (10 arc minutes).

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大面积矩形电弧蒸发源合理的设置靶源磁场并有效的控制电弧弧斑的运动是十分重要的。

It is important to set the magnetic field reasonably and to control the movement of arc on large rectangular target.

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用尺规将一个任意角或弧绝对准确三等分是不可能的。

It is impossible to divide a given common Angle or arc (instead of the particular angles or arcs) into three equal parts by using a rule and compasses.

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