如果你把水藻种在池塘里，但是却不能以正确的角度用光线照射它们，那么如果水藻生长太过密集时，可能会相互遮挡。
If you keep your algae in ponds the rays do not always strike them at the best Angle and the algae sometimes shade one another if they are growing densely.
当使用跳灯时，即使闪光灯以接近垂直的角度向上方打光，但仍有扩散的光线直接照射到被摄体上。
When bouncing your flash, at certain angles close to that perpendicular plane, direct light will hit your subject.
当阳光从卫星拍照的角度照射到水面上时，平滑的水面像镜面一样反射光线，而不平的水面则会散射光线，看上去是黑暗的。
When sunlight hits water at the same Angle as a satellite's view, smooth areas reflect light like mirrored surfaces while rough regions scatter light and appear darker.
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