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.

youdao

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.

youdao

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.

youdao