Imagine a world in which Kagan exists, but Shelly doesn't exist, because nobody in the world is named Shelly.

想象在一个世界里卡根存在,而薛立不存在,因为这个世界里面没人叫薛立

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Of course, that doesn't mean that in the real world one of them does exist and the other one doesn't.

当然,这并不意味着,在现实世界里面其中一个存在,而另一个不存在

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If you look at the history of U.S. Taxes, the very simple history is World War One and World War Two.

如果你看一下美国税收历史，里面提到了一个典型的时期,就是一次世界大战和二次世界大战的时候。

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Look. Suppose we try to imagine a world in which Shelly exists but Kagan doesn't.

设想在某个世界里面,薛立存在而卡根不存在

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