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。
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。
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