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1. The vibrations which constitute a wave in a gas superposed on the random thermal motion.
   气体中形成波的振动叠加在这种无规则热运动上。
2. Moreover, since the atoms are in random thermal motion the frequency spectrum will be altered by the Doppler effect.
   而且，由于原子是在作无规则热运动，多普勒效应也会使频谱发生改变。