1. Errors and uncertainties multiply, cascading upward through a chain of turbulent features, from dust devils and squalls up to continent-size eddies that only satellites can see.
    错误和不可靠性上升，接踵而来的是一系列湍流的徵状，从小尘暴和暴风发展到只有卫星上可以看到的席卷整块大陆的旋涡。

2. What the eye sees as racial differences — between Europeans and Africans, for example — are mainly a way to adapt to climate as humans move from one continent to another.
    我们眼中看到的人种差异，例如欧洲人与非洲人的差异，主要是人类从一个大陆向另一个大陆迁移时为适应气候所产生的。

3. A situation repeated across the continent.
    这种现象在非洲大陆随处可见。

4. Asia is also the most populous continent.
    亚洲又是人口最多的洲。

5. Africa is a very large continent — larger than China, Europe and the United States put together.
    非洲大陆幅员辽阔，比中国、欧洲和美国的总和还大。

6. Sighing, he dipped his brush and passed it along the topmost board; repeated the operation; did it again; compared the insignificant whitewashed strip with the far-reaching continent of unwhitewashed fence, and sat down on a box discouraged.
    他一边叹息，一边拿刷子在桶里蘸了一下，往栅栏高处一抹；接着又一蘸一抹地重复了两遍。他看了一眼刷白的一小条，又看了看那片待刷的无边大陆，垂头丧气地在一只箱子上坐了下来。

7. Central Africa, the most tropical portion of this tropical continent, is a land of heavy rainfall and high plateaus.
    中部非洲是这块热带大陆上最热的地区，雨量充沛，地势很高，

8. Communities across the continent could be connected by such a green belt.
    这一条绿化带可以把遍布全大陆的各个国家连接起来。

9. It overran a whole continent.
    它们在整个大陆泛滥成灾.

10. It is actually connected with Asia at the spot where the Suez Canal was dug. Oceania is the smallest continent.
    它实际上是在开凿苏伊士运河的地方与亚洲相连. 大洋洲是最小的洲.