1900s和19th century区别

问题描述:

1900s和19th century区别
in the late 1900s和in the late 19th century有什么区别?
哪个是18世纪?`哪个是19世纪``?
越详细越好``答的好给积分```

in the late 1900s:20世纪末
in the late 19th century:19世纪末,也就是1800年