A detailed train tickets, air ticket booking system, with a very good reference value.
2
在这个示例中，实际上有两个不同的子过程需要您关心：登记行程与订票和签发机票过程。
In this example, there are actually two different sub processes that you need to be concerned with: the process of booking the trip and the process of ordering and issuing the tickets.
3
新功能不包括机票价格，因此诸如Expedia之类的网站仍将是旅客订票的主流网站。
Flight fares are not part of the new feature, so sites like Expedia will still be the main hub for travelers looking to book tickets.
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