1. By measuring how closely current populations are related, the authors trace the routes by which early humans migrated around the earth. 通过测定当前人类种群间的亲缘关系,作者们弄清了地球上早期人类迁移的路线。
2. And by measuring the time interval between the taps and the receipt of the echoes, the depth of the sea at that point can be calculated. 测出回声间隔的时间,便可算出该处海洋的深度。
3. Measuring the irrigated land men invented surveying and became interested in geometry. 在丈量灌溉土地的过程中,人们发明了测量学,并开始对几何学产生兴趣。