所以你甚至无法想象在一个世界里，薛立存在而卡根不存在。
So you can't even imagine a world in which Shelly exists but Kagan doesn't.
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。
Imagine a world in which Kagan exists, but Shelly doesn't exist, because nobody in the world is named Shelly.
你不可能做到，因为在现实世界里，薛立和卡根指的是，同一个东西的两个不同名字。
And that you can't do, because in the real world of course Shelly and Kagan pick out just two different names of this very same thing.
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