Fireflies emit light but not heat.
萤火虫发光但不放出热。
Another approach is to use materials that emit light.
另外一个途径是利用能发光的物质。
They spontaneously emit light to return to a lower level.
接著它们会自发性地放光而回到较低的能阶。
They emit light which is biased towards the blue end of the spectrum.
它们发射的光偏向色谱的蓝色端。
One day soon, Windows that are transparent by day may emit light by night.
不久的某一天，白天透明的窗户会在晚上发光。
发出了如此强的光。
The light we emit is about 1000 times lower than the naked eye can see.
我们身体所发的光比肉眼能见的低1000倍。
Red sun, and emit colored light.
太阳红红的，放射出五彩的光芒。
Leave some areas of the lamp blank - so to allow some light to emit.
在整体上留下部分空白，让光线可由空白的部分散发出来。
Large ones emit long wavelengths (red light).
大尺寸的发出长波(红光)。
It depends on whether the crystal can emit a powerful beam of light.
这取决于晶体是否会发射出一束强光。
A new type of material that can emit blue light has been prepared.
提供了一种新的蓝光发射材料。
They emit strong red fluorescence both in solution and in solid state under UV light.
这些化合物在紫外光的激发下，固态和溶液都能产生强烈的红色荧光。
The cathode ray tube has the light emitting end that is used to emit ray.
阴极射线管具有用以出射光线的光出射端。
The cathode ray tube has the light emitting end that is used to emit ray.
阴极射线管具有用以出射光线的光出射端。
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