为了研究原因，剑桥大学鲁弗斯•约翰斯通利用计算机模型预测抚养后代的益处。
To study why this is so, Rufus Johnstone of the University of Cambridge used computer models to estimate the benefit of helping groupmates.
委员会由托马斯·杰斐逊领导，成员有约翰·亚当斯、本杰明·富兰克林、菲利浦·利文斯通和罗杰·舍曼。
Headed by Thomas Jefferson, the committee included John Adams, Benjamin Franklin, Philip Livingston and Roger Sherman.
委员会由托马斯·杰斐逊领导，成员有约翰·亚当斯、本杰明·富兰克林、菲利浦·利文斯通和罗杰·舍曼。
Headed by Thomas Jefferson, the committee included John Adams, Benjamin Franklin, Philip Livingston and Roger Sherman.
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