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.

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。

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LED light sources complying with these specifications are utilized as the source of illumination in lighting products that comply with the appropriate end-product standard as listed below.

符合规范要求的LED光源被用作灯具产品的照明源，这些灯具产品都要符合到如下所列的其对应的成品安全标准要求。

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The main source of illumination is called the key light. The key light is frequently supplemented by subsidiary lighting. The chief source of light for outdoor shooting is sunlight.

主要光源称为主光。主光常常用辅光作补充。室外拍摄的主光为阳光。

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Admittedly, this unusual memory requires an internal light source, but the amount of illumination required is tiny and consumes less power than the logic circuits that are used to read data in and out.

ECONOMIST: Just press print