但这个博弈的关键在于，由于公共品所具有的非排他性，使得一个不对合作做任何贡献的背叛者（Defectors）也可以通过搭便车获取合作收益，从而获得比合作者更高的净收益。
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N-COUNT A defector is someone who leaves their country, political party, or other group, and joins an opposing country, party, or group. 叛逃者 [usu with supp]
Their focus is no longer on liberating Somalia, the defectors said, but on something bigger.
叛逃者说，他们的目标不再是解放索马里，而是一些更伟大的东西。
A former port with a wealth of 18th - and 19th-century townhouses, it is now home to an ever-growing number of antiques shops, galleries, restaurants and cafes, many started by urban defectors.
这里曾经是港口，有大量建于18和19世纪的联排别墅，如今开设了越来越多的古玩店、画廊、餐厅和咖啡馆，许多商铺是由逃离城市的居民设立的。
But defectors are growing in number and are getting better organised.
但是，倒戈者越来越多而且越来越有组织。
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