It is always necessary to book a seat on the train.

一般有必要在火车上预订座位。

It is always necessary to book a seat on the train.

一般有必要在火车上预订座位。

A price-sensitive student might be only be able to pay 200 dollars so she books a seat weeks or month in advance.

对价格敏感的学生可能只能支付200美元，所以她可以提前几周或一个月预订座位。

The restaurant is not far from my home, in a shopping mall, and I deliberately booked a seat near the window.

餐厅离我家不远，在一个商场里，特意订了靠窗的位子。

So when a customer goes to book a seat, the airlines determines the price they see by analyzing a wide range of factors including the status of their entire network.

因此，当客户去预订座位时，航空公司会通过分析包括整个网络状态在内的多种因素来确定他们看到的价格。