The post office is to the east of the cinema.这样才对英语中表示方向前面是需要介词的在内部用in---Dalian is in the north of China.在外部接壤时用on---Mongolia(蒙古)is on the north of China.在外部不接壤时用to---Japan is to the east China所以这里用to这个介词
邮局在电影院的东边。