They decided to examine the issue after dairy farmers noticed their cows had slightly different moos, depending on which herd they came from.

 
  • 他們決定研究這個(gè)問(wèn)題,在牛農發(fā)現他們的牛哞哞叫的聲音有點(diǎn)不同,端視牠們來(lái)自哪個(gè)牛群而定。
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