but strengthens social bonds. 也能增强群体内部团结

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  1. Indian rivers are home to the world's most social otter -
    印度河里住着世界上最具社会性的水獭
  2. smooth-coated otters form family groups up to 17 strong.
    印度水獭的一个家族可多达17名成员
  3. Group rubbing not only refreshes their coats,
    集体“按摩”不仅能清洁它们的皮毛
  4. but strengthens social bonds.
    也能增强群体内部团结
  5. When it comes to fishing
    当它们去捕鱼时
  6. there is real strength in numbers.
    群体合作能保证它们屡战屡胜
  7. Fishing practice begins when the cubs are four months old.
    小水獭在4个月大时就开始学习捕鱼

来自《行星地球 第一季 第三集 Planet Earth S01E03 淡水》第 86 行

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