时差N小时:蓝鲸是天生的歌唱家(下)

Wow! That is nearly ten times greater than thedifference observed in the whales. Pretty amazing,right? But, why are they such pitch perfectionists?Well, one hypothesis has to do with the Dopplershift. Really? You mean the acoustic effect thatmakes the pitch of an ambulance siren sound asthough it’s higher as the ambulance approaches andlower after it passes you. Exactly. Since the whale’spitch is so accurate, they hypothesize that otherwhales may be able to locate an individual bylistening for a slight shift in pitch that would becaused by the Doppler effect as the two whales move towards or away from each other. That'samazing. Hey,I wonder if any blue whales offer singing lessons.

哇!那比观察到的鲸鱼中的差距要大10倍。很令人惊讶，对吧?但是为什么它们能发出如此完美的声音吗?一种猜想是与多普勒频移有关。真的吗?你是说声学效应使救护车临近时鸣笛声更响亮，而当它经过你时，声音会变弱。正是。因为蓝鲸的音高非常精准，当2只蓝鲸彼此游近或远离时，它们倾听由多普勒频移引起的音高中的微弱变化，就能推定其它蓝鲸的位置。那真令人惊奇。嘿，我在想是否有蓝鲸教唱歌的课。

词语注释：

Doppler shift 多普勒频移