中心地的等级越高，其服务的区域越大，此类中心地的数量越少。

世界上充满了微小的善意，只要你知道在哪里寻找。

我们高估了一年能做的事，低估了十年能做的事。

At that age， I'd take any excuse to make estimates and do minor arithmetic. I'd calculate our gas mileage -- figure out useless statistics on things like grocery spending. I'd been hearing an ad campaign about smoking. I can't remember the details， but basically the ad said， every puff of a cigarette takes some number of minutes off of your life: I think it might have been two minutes per puff. At any rate， I decided to do the math for my grandmother. I estimated the number of cigarettes per days， estimated the number of puffs per cigarette and so on. When I was satisfied that I'd come up with a reasonable number， I poked my head into the front of the car， tapped my grandmother on the shoulder， and proudly proclaimed， "At two minutes per puff， you've taken nine years off your life！"

出自先秦《荀子·大略》。嘴巴说好话，行动做坏事，这是国家的妖孽。这是对那些口是心非、伪善无耻之徒的斥责之语。