microwave amplification by stimulated emission of radiation maser
辐射脉泽的受激发射微波放大
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Before the laser, scientists developed a similar device: a maser which stands for Microwave Amplification by Stimulated Emission of Radiation.
VOA: special.2010.09.01
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