illumination是什么意思

　　例句：

　　Direct illumination is harsh and unflattering.

　　直射光照明既刺目又呆板。

　　No further illumination can be had from this theory.

　　这一理论不能给人以更深刻的启迪。

　　The only illumination came from a small window high in the opposite wall.

　　唯一的亮光来自对面墙上高处的一扇小窗子。