这给战斗添加了一个策略因素就是何时召唤它们。

This adds an element of strategy in determining when to summon your pet.

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总的来说，这些因素可能选择不爬树作为懒熊幼崽的防御策略。

Collectively these factors probably selected against tree-climbing as a defensive strategy for sloth bear cubs.

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但是风险在于这种成功策略的关键因素之一安卓系统正转变为致命弱点。

But there is a risk that Android, a key element in this successful strategy, is turning into a vulnerability.

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