#召唤陪练狮#
Energy expenditure and security risks are some of the costs to animals of play behavior, but the costs are not so great that they outweigh the long-term benefits of play to the species.老师好~话说这是TPO30第一篇最后一题的选项 根据原文意思和选项中的so that 这个句子的意思实质上是:成本没有大到可以超过......
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嗯,对,可以这样理解。虽然有 cost,但是没有长远看来的收益高。
2017-01-09 17:11:03