Sustainability isn't a choice—it's our responsibility to future generations.
I'm not a businessman. I'm a designer and an engineer.
解释:善于制造弓箭的工匠之子,必须先从编织簸箕开始;善于冶炼的工匠之子,必须从连缀皮裘开始。
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。
A theory that lacks beauty is unlikely to be correct.