如果你想像卡根不存在，那么你也就是在想象那个唯一的东西，薛立·卡根不存在。
And if you imagine Kagan not existing, then you're imagining that single thing, Shelly Kagan, not existing.
所以如果想象了薛立存在，那么当然你也就想象了那一个东西，薛立·卡根存在。
And so if you've imagined Shelly existing then of course you're imagining that single thing, Shelly Kagan, existing.
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.
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