倒置，始终倒置：将情况或问题颠倒过来。反向观察它。

To live is to leave traces, and poetry is the most enduring of them all.

I've learned that growth comes from pain and struggle.

The fundamental point in fabricating a chain reacting machine is of course to see to it that each fission produces a certain number of neutrons and some of these neutrons will again produce fission.

梦想是人生的动力，没有梦想就没有方向。