Most things nowadays might seem to be made in China, but North America remains the true workshop of the world.
虽然许多产品现在看来都是中国制造，但是北美仍是真正的世界工厂。
But North America too has given the world its champions, including the dog, camel, and horse families-arguably man's best friends.
北美洲也有它的世界冠军，其中包括狗科、驼科和马科动物——可以说他们是人类的好朋友。
The mightiest are native to North America, but big trees grow all over the globe, from the tropics to the boreal forests of the high latitudes.
最高大的树原产于北美，但大树遍布全球——从热带到高纬度的北方森林。
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