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12.1 大气的构成用光学仪器观察往往要穿过连绵不断的大气,于是大气的影响是很重要的。在分析大气对光学信号的影响以前,我们必须简单地回顾一下大气的构成。
12.1 Composition of the atmosphere Observing with optical instruments often passes through an endless stream of air, so the effects of the atmosphere are important. Before analyzing the effects of the atmosphere on optical signals, we must briefly review the composition of the atmosphere.