如果你年轻时没有学会思考,那就永远学不会思考。
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。
When I got to 40 or so... I had the sense when I looked back over my life I would actually see a mess of decisions, a few of which I had thought about, some of which I had sort of stumbled on, and many that I had no control over whatsoever.
采矿中的每一个挑战都是创新的机会。