Mapping the cosmic microwave background is hard because the Milky Way itself shines quite brightly at these wavelengths, making the background hard to discern.
描绘宇宙微波背景辐射是很困难的，因为银河系本身在这些波长发射很多，使得背景辐射难以分离出来。
The Low Noise Amplifier is widely used in Universe Communication, Radars, Electronic Countermeasures, Telemetry and Remote Mapping, Radio Astronomy, Geodetic, Microwave Communications, etc.
低噪放广泛地应用于宇宙通讯、雷达、电子对抗、遥测遥控、射电天文、大地测绘、微波通信等无线电通信系统中。
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