新人999本文目录：
在中国东部的所有英语表达，速度
中国东部：in the east of China
中国西部：in the west of China
中国北部:in the north of China
中国南部:in the south of China
[英语]是in the north of china还是in the northern of China?
north是名词
northern是形容词
in the north of China或者in northern China或者in North China（华北）
