In optics one usually deals with a source which emits light within a narrow, but nevertheless finite, frequency range . 在光学中，常常遇到的是这样的光源，它所发射的光频率范围虽窄，但仍有一定的宽度。
The results thus far obtained are rather divergent partly because different radiation are emitted at different heights . 迄今得出的结果颇为分歧，其原因，一部分是因为各种不同的辐射是在不同的高度上发射的。
At infrared wavelengths the region is less opaque, and cool protostars are expected to emit most of their energy in the infrared . 在红外波长范围，暗云区是较透明的，而冷的原恒星应在红外区发射其能量的大部分。
As we've seen, the laser is distinctive in that it emits all its energy in the form of a single, narrow, diffraction-limited beam . 我们已经看到，激光器的一个突出之点，就是把全部能量都集中在一个很窄的，由受衍射限制的光束内射出。
Once damage is initiated, adjoining regions become susceptible, giving rise to a "zipper" effect which continues until the whole of the strongly emitting region is eventually damaged . 一旦出现损伤，邻近地方就变得很敏感，并可产生一种"闪光环"效应，直至继续到整个强烈发射区都损伤为止。
How to : define a generic type with reflection emit 如何：用反射发出定义泛型类型
Compiling a regular expression using reflection emit 使用反射发出编译正则表达式
Weather radar emits microwave at fixed time intervals 天气雷达会定时发出微波。
Monitors for gamma emitting radionuclides in water 水中辐射放射性核素的监视器
