左侧是编号NGC 7000的发射星云，或多或少由于它形似我们的地球上的北美洲大陆而著名。
On the left is an emission nebula cataloged as NGC 7000, famous partly because it resembles our fair planet's continent of North America.
虽然人知道关于许多上百的石棉年，它在北美洲大陆第一次被开采的它不是直到160年前那。
Although man has known about asbestos for many hundreds of years, it was not until 160 years ago that it was mined for the first time on the North American continent.
长期以来，北美洲大陆的能源基础设施主要都是为了满足美国这一全球最大的能源消费国需求而建的。
The continent's energy infrastructure has long been configured to feed the U. S. , the world's largest consumer.
应用推荐