These different types should be treated in alternate flows of events, and the business rules must also consider them, by computing room charges under different booking types, for example.
这些不同的类型应当按照可选流来对待，并且业务规则也必须考虑它们，例如，通过计算不同预订类型的房间费用。
Be Flexible to Find Savings - For travel to or from an area with multiple airports, ask your travel counselor to search alternate airports or use this option in your online booking tool.
灵活安排，节省费用：如果是出差到一个有多个机场的地方，可以咨询你的旅游顾问，看看是否能选择其它机场，或在线预订时灵活选择。
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