But our tour guide says that admission tickets are not available at the ticket office and must be booked in advance.
可是，导游告诉我，现在，布达拉宫的门票很难买到，需要等候预约。
For example, if the tickets required for a trip are not available, reservations for hotel rooms or rental cars that have already been completed must be canceled.
例如，如果无法获得旅行所需的机票，那么就必须取消已经完成的对宾馆房间或租用汽车的预定。
Tickets for this production are not available as the theatre has not yet been selected.
当剧场还没有被选择的时候，为这制造的票不是可得。
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