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。

youdao

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。

youdao

Only about 10%-30% products will be emitted as PM into atmosphere through tailpipe, but most parts will deposit on surface of engine, exhaust system and catalytic converter.

约10％-30％的燃烧产物会以颗粒物状态随尾气排放到大气中，而其余大部分则沉积到发动机、排气系统及催化转化器的表面。

youdao

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