And even just the air in a clear sky blocks a huge range of the wavelengths of lights, pretty much only letting through visible light, anda smattering of infra-red and radio waves.

即便晴空万里光是空气就会挡住很大范围的光波波段，几乎只允许可见光、以及少数红外光和无线电波通过。

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They support applications that require a broad wavelength range from UV to infra-red light, such as spectroscopy.

它们支持应用，需要在宽的波长范围从紫外到红外光，例如光谱学。

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These include a camera, ultrasound, infra-red and thermal sensors, a range-finder sensor, a temperature sensor and ground detectors.

这些包括照相机，超声波，红外线和热传感器，一个测距仪传感器，温度传感器和地面探测器。

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Each Global Hawk has infra-red and radar sensors, and a surveillance range of 100 miles.

ECONOMIST: Unmanned aircraft

So far, this has been possible only at infra-red wavelengths and, even then, only in a narrow range of wavelengths.

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