1. Collectively these factors probably selected against tree-climbing as a defensive strategy for sloth bear cubs.
    总的来说，这些因素可能使得爬树对于懒熊幼崽而言不是一个很好的自保策略。

2. All day long the sloth hung upside down in the tree.
    白天树懒都倒挂在树上。

3. Its closest living relative - the three-toed tree sloth - is tiny by comparison.
    它的活着的最近的亲戚是三足树懒，相比之下，这种动物体型很小。