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]
On a recent afternoon, a group of defectors could be seen eatinglunch.
不久前的一个下午，还可以看到一群逃难者在吃午饭。
We met with defectors away from their actual places of work or residence.
我们采访了从工作地或者是居住地逃跑的人们。
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。
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