Getting children to play together cooperatively depends less on their personal social skills and more on what they are doing – especially if they are not friends – a study shows.

· · 来源：tutorial资讯

{ 51, 19, 59, 27, 49, 17, 57, 25 },

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Stateful transforms are simple objects with member functions that maintain state across calls:，更多细节参见heLLoword翻译官方下载

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