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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All LED magnifiers provide a very even illumination of the field of view. The required voltage of 3.6 volt is provided by two batteries (AA or a) via a step-up converter.

所有的LED带灯放大镜都可以提供视场均匀照明，所要求的3 . 6伏电压由两节电池通过一个升压变换器完成。

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Even the softer measures of earned/social media get translated into KPIs and optimized mostly because we can, but also because those metrics can provide illumination and insight when used correctly.

虽然有效的软措施可以转化为关键考核因素并进化优化主要是因为我们能做到这点，但同样也是因为这些指标可以给予我们启发，如果我们使用正确的话。

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The Aura HD has other best-in-class features, like remarkably even lighting (the illumination of the lighted Kindle and Nook models is splotchy, by comparison) and, thanks to a zippy 1-GHz processor, faster page-turns and a more responsive touch-screen.

WSJ: The Best E-Reader: Kobo's Aura HD

In other words it requires treatment with chemicals, or illumination with ultraviolet light, in order to make it visible enough to work with and, even then, it is often indistinct.

ECONOMIST: Fingering fingerprints | The