Like brown bears and polar bears, sloth bears may have evolved in an environment with few trees.
和棕熊和北极熊一样，树懒熊可能是在树木稀少的环境中进化而来的。
Sloth bears also have relatively large canine teeth, which appear to be more functional for fighting than for foraging.
树懒熊也有相对较大的犬齿，它们似乎更适合战斗而不是觅食。
Sloth bears also have relatively large canine teeth which appear to be more functional for fighting than for foraging.
懒熊也有相对较大的犬齿，这些牙齿看上去格斗功能强于觅食功能。
Sloth bears also have relatively large canine teeth which appear to be more functional for fighting than for foraging.
懒熊也有相对较大的犬齿，这些牙齿看上去格斗功能强于觅食功能。
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