up town释义：
到城里
例句：
He'd come up town in his greasy overalls and sweaty blue shirt， with his face streaked up with smoke.
他穿着油腻的工裤和汗渍的蓝衬衫，脸上还带着一道道烟痕就进城了。
down town释义：
进城商业区城市中心
例句：
At the down town Hilton Hotel.
住在城中希尔顿饭店。
词组：
downtown area市中心
go downtown到市区
downtown manhattan曼哈顿闹市区（纽约市中心商业地带）
