Because the sound is made in the air along this column, it does not follow the inverse square law, which says it drops off about two thirds every time you double the distance: 6dB every time you go from one meter, for instance, to two meters.
因为声音时沿着空气中这条带形成 它不遵循平方反比定律 也就是说距离每增加一倍 它就会减弱大约三分之二 例如：你从1米走到2米，声音就会减弱6分贝