back flash

例句：

1. 1. The camera's back flash was the only way to capture the moment.
   相机的背光是唯一捕捉到那个瞬间的方式。
2. 2. The rear light of the car illuminated the dark alleyway.
   汽车的后灯照亮了黑暗的小巷。
3. 3. The rear illumination from the street lamps made it easier for her to navigate.
   街灯的后光使她更容易导航。