1. The continents form rugged tablelands which stand nearly three miles above the floor of the open ocean.
    大陆是崎岖不平的高地，高出辽阔的海洋海底近三英里。

2. 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，

3. This is what the sculptor must do. He must strive continually to think of, and use, form in its full spatial completeness.
    而雕塑家就必须做到这一点。他必须勤于想像并且利用形体在空间中的完整性。

4. The Moon is likely to become the industrial hub of the Solar System, supplying the rocket fuels for its ships, easily obtainable from the lunar rocks in the form of liquid oxygen.
    月球很可能成为太阳系的工业中心。从月球上的岩石中很容易提炼出液态氧，作为航天飞船的燃料。

5. They also have the disadvantage of being an expensive form of transport.
    飞机另一个缺点是昂贵。

6. The tops of trees form a kind of roof, under which there is little light, as the sun cannot get in, and it is very quiet because the trees keep out the wind.
    树冠形成一种顶篷，阳光几乎无法透入，所以林中光线很暗。又因为树木挡住了风，所以林中也很寂静。

7. Tiny drops of water in the air form clouds.
    空气里的小水珠形成了云。

8. Talking with people is one of my favorite activities, so being able to speak a new language lets me meet new people, participate in conversations, and form new, unforgettable friendships.
    我乐于与人交谈，新的语言使我能与以前不认识的人交往，参与他们的谈话，并建立新的难以忘怀的友谊。

9. The best sources of iron, and the only sources of the form of iron most readily absorbed by the body, are meat, chicken, and fish.
    最好的铁离子来源，以及惟一最易为身体所吸收的铁离子来源，是肉、鸡和鱼。

10. Tai chi is just one form of exercise studied for its fall-preventing benefits as part of a recently completed six-year project by the National Institute on Aging and the National Institute of Nursing Research.
    全国老龄协会和全国护理研究协会最近完成了一个为期六年的研究项目，其中一部分是研究太极等锻炼方式在防止摔跤方面的益处。