根据理论模型推测，地壳在大地震发生前的数小时内很不稳定，但要在现实世界中探测到这样的不稳定性还是个挑战。

Theoretical models predict that the crust is unstable in the hours leading up to a major earthquake, but detecting that instability in the real world has proven a challenge.

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为了进入最好的学校，得到最好的工作，一个人不得不进最好的中学，而根据理想的推测，就意味着先进最好的小学，以此类推。

To get into the best colleges, to get the best jobs, one has to go to the best high schools, which in perfect theory takes the best primary school, and further.

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We add up the goods, subtract the bads-- whatever our favorite list is-- and we come to our best educated guess about the rival evaluations of not just lives as a whole, but chunks of lives.

我们把好事加起来减去坏事-,不管我们最喜欢哪些事-,我们不但可以据理推测,一生期间其他生活的价值，还能推测某段时间其他生活的价值。

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