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.

　　這一理論不能給人以更深刻的啟迪。

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

　　唯一的亮光來自對面墻上高處的一扇小窗子。