| 1. | North america has vast deposits of shale .
北美有大量油页岩沉积。 |
| 2. | The bering strait parts north america from asia .
白令海峡把北美洲和亚洲分开。 |
| 3. | Great tongues of cold air at times sweep down over north america .
巨大的冷空气“舌”常常侵袭北美。 |
| 4. | In north america more than 70 different railway times were in use up to 1882 .
到1882年为止，北美使用过70多种铁路时间。 |
| 5. | Before that, north america and europe were not yet entirely separated from each other .
在这之前，北美与欧洲还没有完全相互分隔开来。 |
| 6. | Today, north america is not only the world's breadbasket, but its feed bag as well .
今天，北美不仅是世界的粮仓，而且也是世界的饮料库。 |
| 7. | The symbols and notation used herein are essentially those in current use in north america .
这里采用的符号和表示方法实际上是北美洲通用的。 |
| 8. | It is estimated that about half of the carbonate oil and gas reservoirs in north america are in dolomite .
据估计，北美的碳酸盐岩油气藏有一半是在白云岩内。 |
| 9. | At jamestown, in 1607, the english made their first successful settlement in north america .
1607年，英国人在詹姆斯敦建立了他们在北美洲的第一个有成就的殖民地。 |
| 10. | The english arrived in north america with hopes of duplicating the exploits of the spanish in south america .
英国人抱着和西班牙人开拓南美洲一样的动机来到北美洲。 |
