Black bear cubs use trees for defense, whereas brown bears and polar bears, which regularly inhabit treeless environments, rely on aggression to protect their cubs.
黑熊幼崽用树来防御，而经常生活在没有树的环境中的棕熊和北极熊则依靠攻击性来保护它们的幼崽。
After that, Father Bear, Mother Bear, and the old brown bear talked about how young bears should be brought up.
接着，熊爸爸、熊妈妈和老棕熊讨论了应该怎样抚养小棕熊的话题。
The old brown bear made a speech first.
年老的棕熊首先发表了一篇演讲。
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