A place to listen and talk about The Doppler Effect, Citywide, or Earshot.
f'=f (vv0加減vvs減加)factor接近取上方符號遠離取下方符號悉怛多缽怛囉阿門
f'=f (vv0加減vvs減加)factor接近取上方符號遠離取下方符號
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