注意物体上光线的反弹和反射。
Notice we have light bouncing and reflecting off our objects.
照相机是用来控制照射到胶片上光线的强弱的。
A camera is used to control the amount of light that falls on the film.
这是因为光源越广，射在物体上光线的方向就越多，这会起到增加场景中的照明、减少阴影的作用。
This is because, with a broad source, light rays hit your subject from more directions, which tends to fill in shadows and give more even illumination to the scene.
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