The inner surface of the plastic indicating head is made into a polygonal mirror surface, so the direction indicating device which can reflect light rays of various angles is very conspicuous.
塑料指示头内表面制成多棱镜面，能反射各种角度的光线，非常醒目。
A compass is any magnetically sensitive device capable of indicating the direction of the magnetic north of a planet's magnetosphere.
罗盘是一种磁敏仪器，能够指示某一星球磁器圈的北极。
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