In the case of lidar, the waves are in the form of an infra-red laser beam.

至于激光雷达，电磁波是以红外激光束的形式发射的。

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Light is an electromagnetic wave, with a longer wavelength than X-rays and ultraviolet, and a shorter wavelength than infra-red, microwaves and radio waves.

光是一种电磁波，其波长长于X光和紫外线，短于红外线、微波和无线电波。

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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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Even something too small to emit visible light will probably give off radio waves and infra-red radiation (Jupiter does).

ECONOMIST: X marks the spot

In the case of lidar, the waves are in the form of an infra-red laser beam.

ECONOMIST: Forest conservation