礼貌，并不需要花钱。用完马桶后，把马桶盖放下；上电梯时，耐心等别人出来再进去；把购物车放回指定区域；在借东西时，归还时要东西的状态要比你借的时候还要好（例如给车加满油、把物品清理干净）。
Courtesy costs nothing. Lower the toilet seat after use. Let the people in the elevator exit before you enter. Return shopping carts to their designated areas. When you borrow something， return it better shape (filled up， cleaned) than when you got it.
The trouble with the world is that the stupid are cocksure and the intelligent are full of doubt.
计算的未来在云端。
感知的动态受“完形律”（良好形式）原则支配。
I’ve always been drawn to the mystery and beauty of music.