你好！1. 你没错，It is raining outside 是 “外面下着雨”“窗外” 的英语是outside the window窗外下着雨 = It's raining outside the window如果是窗外下着大雨可以这样说：It's raining heavily outside the windowIt's pouring outside the window或It's raining cats and dogs outside the windowraining cats and dogs 是成语。2. 售票大厅直译是 ticket hall但我们一般称之为 ticket office请不要在售票大厅以外的地方，购买车票。可译为Please do not purchase tickets outside the ticket office我觉得更精确的表达方式是Please purchase tickets only from the ticket office.或Tickets should only be purchased from the ticket office.
