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）。

The snake has to shed his skin before he can grow.

可持续性不是一种趋势，而是负责任商业的未来。

Coal has powered our past, but we must be honest about its role in our future.

贫家如果要仿效富家的穿衣吃饭及庞大的花费，那就一定会很快招致灭亡。