在线等，这句话怎么理解：the costs are not so great that they outweigh the long-term benefits of pl

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.
后半句我认为是说代价远胜益处，但是按答案逻辑应该反过来才对，谁帮忙解释一下（tpo30 role of play in development 14)

they = the costs, The costs are not great enough to outweight the long term benefits of play. 从句前有一个not so great, 所以句子是说这些代价不足以outweight嬉戏带来的长远利益。 所以the long term benefits of play更重要。

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