Less obvious but just as real, is the infrared radiation emitted by the surface, and by the air.

由地面及空气发射的红外辐射虽不如它明显，然而却同它(可见光)一样实际存在着。

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NBI changes the white light normally emitted by the colonoscope to a bluish light, providing a narrower wavelength and enhancing visual contrast of the surface structure of the colon.

窄带成像技术将结肠镜常规发射的白光改变为蓝光，以此提供一个较窄的波长，加强结肠表面结构的视觉对比度。

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The microwaves emitted by the radar station could penetrate the Earth's surface - which means it would be able to see not only land, but under the sea and underground as well.

雷达站发射的微波可以穿透地球表明，这意味着不仅可以看到陆地，还能看到海底和地底的情况。

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Certain elements on the surface emitted X-rays when the sun zapped Eros with an intense burst of radiation for 30 minutes on May 4.

CNN: Asteroid Eros resembles 'building blocks' of Earth

The Corot spacecraft detects the oscillations as subtle variations in the light emitted by the star as the surface wobbles.

BBC: Team records 'music' from stars

That surface wave, in turn, produces another electric signal, which is emitted via the transducer.

ECONOMIST: MONITOR