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.

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Source: Computational Materials Science, Volume 266

他还否认了赴俄罗斯的可能性，表示愿在俄罗斯和白俄罗斯以外的地方与俄方对话。（新华社）

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const pos = position[i];。业内人士推荐服务器推荐作为进阶阅读

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