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. Though they may attain considerable accuracy in the perception of flat form.
    虽然他们可能获得相当准确的平面形态感觉,

3. Though they may attain considerable accuracy in the perception of flat form,
    虽然他们对平面形的感觉能达到相当准确的程度，

4. 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。

5. Someday soon it may actually become possible to predict earthquakes with accuracy.
    在不久的将来，精确预测地震将成为可能。

6. 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。

7. Unfortunately, this is a point often overlooked by teachers of language, who demand faultless accuracy from the beginning.
    不幸的是，这一点却常常被讲授语言的老师们所忽视，他们从一开始就要求完美无缺的准确。

更多句子>>>