Discretion rather than terror prompted the boy to turn back instead of passing the light, with a view of asking Miss Eustacia Vye to let her servant accompany him home.

出于小心谨慎而不是恐惧害怕，男孩于没有继续往前穿过这道光，他转身往回走，想叫游苔莎·维伊送他回家。

The key to understanding what that means lies with the term refraction, the ability of a transparent medium, like glass, water, or the eye to change the direction of light passing through it.

理解这代表什么的关键取决于这个术语折光能力，一个透明媒体的能力，如玻璃，水，或者眼睛，当光穿过它时，来改变光的方向。