以下为句子列表：
英文: Hunting their living meat, as the Yeehats were hunting it, on the flanks of the migrating moose, the wolf pack had at last crossed over from the land of streams and timber and invaded Buck's valley.
中文: 在正在迁移的麋鹿群的两侧，狼群像叶海特人一样猎取活物，他们越过河流交织、树木成片之地，来到巴克所在的山谷。
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英文: It relies on trust, and a good memory for favours given and received, but is otherwise not much different from simultaneous collaboration (such as a wolf pack hunting) in that the benefit exceeds the cost for all parties involved.
中文: 这种形式下的行为依赖的是相互信任，对自己所施与和得到的好处有个好的记忆，但是这与即时协作没有多少的区别（如在狩猎中运用狼群战术），原因是个人的既得利益是高于所有参与人所做出的施舍。
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