知世郎在历史上真有其人，叫王薄，“知世郎”的名字，也来自王薄自己写的歌谣。
Dogs act like toddlers when you need help - but cats just watch. Scientists compared 3 groups: pet dogs, cats, and human toddlers in an experiment where a human parent hides and pretends to look for an object. 75% of dogs and children helped. Cats only helped if it was in their personal interest.，这一点在safew官方版本下载中也有详细论述
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