... 脉冲波源 impulsive source 振动波源 vibratory source 变电波源 variable radio source ...
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当振动着的波源逐渐靠近观测者时，测量到的频率比从波源发出的频率高。
When a vibrating source of waves is approaching an observer, the frequency observed is higher than the frequency emitted by is lower than that emitted.
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