不过，估计它们的年龄取决于恒星如何生存与死亡的理论。

But estimates of their ages depend on theories of how stars live and perish.

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Shaw还有一条理论，“像我们这个年龄的人知道婚姻是一个很现实的可能，我们踌躇着是否应该这样做。”

Shaw has another theory. "People our age know that marriage is a real possibility."

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教授从理论上推测了地球的年龄。

The professor theorized about the age of the earth.

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