Africa，名词词性，意为非洲，例如：
1.Living in Africa was very different from home and quite an experience.生活在非洲完全不同于在家里，那真是一次不同寻常的经历。
2.Many years later I returned to Africa but that's another story.多年以后我又重返非洲，不过这是后话了。
3.South America separated from Africa 200 million years ago.2亿年前南美洲和非洲分离。
