A lens is an optical system including two refracting surfaces.

一个透镜是包含两个折射面的光学系统。

Here visitors can watch the sky through a 130 mm. refracting telescope.

在这里，参观的人可以通过一架130毫米的折射望远镜观看天象。

This "green flash," caused by light refracting in the atmosphere, is rarely seen.

这种“绿色闪光”，是由大气中的光折射所引起的，很难见到。

The Classic series is unique for its magic of refracting light in bold half-arc.

经典系列具有可以神奇般折射光线的坚实的半弧型，非常独特。

Crystals having this property are said to be doubly refracting, or birefringent.

具有这种性质的晶体叫做双折射晶体。