downtown,uptown和midtown的区别?

它们的意思本身差别就很大
downtown
adv.
在(或往)城市的商业区
They went downtown to see a ballet.
adj.
城市商业区的[B]
Our downtown office stays open till eleven.
我们城里的办公室一直开到十一点.
n.
城市商业区,闹区[C]
uptown
adv.
【美】在(或向)城镇非商业区;在(或向)住宅区
He rented an apartment uptown.
他在住宅区租了一间公寓.
adj.
【美】在(或向)城镇非商业区的;在(或向)住宅区的
She went to the uptown post office.
她去住宅区的邮局.
n.
【美】非闹市区,住宅区[U]
He lived in a quiet section of uptown.
他住在住宅区的一个安静的地段
midtown
n.
商业区和住宅区的中间地区
With its thriving mixed-use community,Midtown offers an environment that exemplifies the unique experience of urban living.

uptown
adv.在(或向)城镇非商业区, 在住宅区
adj.住宅区的
n.住宅区
midtown
adj.市中心区的, 位于市中心区的
n.市中心区(商业区和住宅区的中间地)
downtown
adv.在市区, 往市区
adj.市区的

downtown
adjective [before noun], adverb US
in or to the central part of a city:
-downtown Los Angeles
-a downtown address
-I work downtown, but I live in the suburbs.
downt...

补充一下，uptown还有富人区或者上层社区的意味在里面。