Several different applicator arrays are suitable for use with the system, and comprise generally cylindrical annuli which emit radiation toward a central axis.

几个不同的辐射器阵列适于和所述系统一起使用，并通常包括朝中央轴线辐射的柱形环体。

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The discrepancy is due to greenhouse gases in the atmosphere, which absorb and re-emit infra-red radiation, and thus keep the lower atmosphere, and the surface, warm (see the diagram below).

究其原因，原来是大气中的温室气体造成了这种温度上的差异。温室气体吸收，并再度释放了远红外辐射，使得底层大气与地表保持温暖(参见以下附图)。

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Dark matter is the term for matter which cannot be detected directly, because it does not emit or reflect light or radiation - or, at least, not enough to be detected by our present sensors.

暗物质是一种人类不能直接观察到的物质，因为它既不反射也不释放光线或放射线——至少，我们现有的探测器无法观测到它。

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There are not many devices which emit radiation at several million million cycles per second, and those that do exist are unwieldy.

ECONOMIST: Physics

The new work focuses instead on cold, dense masses of gas that have markedly less random motion, and which emit their radiation in the microwave part of the electromagnetic spectrum.

BBC: Supermassive black hole weighed using new scale

The change also will likely squelch pilot complaints about going through full-body scanners, some of which emit low levels of radiation.

CNN: U.S. pilots to get speedier screening procedures