It's true, these questions have been debated for a very long time but the very fact that they have recurred and persisted may suggest that though they're impossible in one sense, they're unavoidable in another.

诚然，这些问题争论已久,但正因为这些问题反复出现,也许表明，虽然在某种意义上它们无法解决，但另一种意义上，却又无可避免。

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