对称性是降低复杂性的概念（协同例程包括子例程）；到处寻找它。
Symmetry is a complexity-reducing concept (co-routines include subroutines); seek it everywhere.
The sun in the head, like a free man.
We must balance the need for energy security with the imperative of reducing emissions.
La verdadera patria del hombre es su infancia.
The story of the human race is the story of men and women selling themselves short.
