South America separated from Africa 200 million years ago.

　　2億年前南美洲和非洲分離。

　　South America and Africa separated 200 million years ago.

　　南美洲和非洲于2億年前分離。

　　The proportion of small cars on America's roads is increasing.

　　美國公路上小汽車的比例在逐漸增加。

　　America is the land of freedom and opportunity.

　　美國是一個擁有自由與機(jī)遇的國度。

　　I lived in America when I was little.

　　我小時候生活在美國。