It was like when you make a move in chess and just as you take your finger off the piece, you see the mistake you’ve made, and there’s this panic because you don’t know yet the scale of disaster you’ve left yourself open to.

The woodcutter's axe begged for its handle from tree,the tree gave it.

In computer science, the simplest solution is often the most elegant and effective.

“伟大的代价是责任。”