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.
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）。
Good science requires both creativity and discipline.
我不需要理由去善良。
I don’t let success change me, I let it improve me.
理论物理学之于数学，犹如雕塑之于几何学。
The strongest is never strong enough to be always the master， unless he transforms strength into right， and obedience into duty.
释义：用兵讲究诡诈之道，为将者重在智慧。胜利靠智取，不靠蛮力。