At the same time, airports have been developing and expanding the range of services that they provide specifically for the business traveller in the terminal.
与此同时，机场一直在发展和扩大这些服务的种类范围，这类服务是特地为航站楼的商务旅客提供的。
2
Three of them (Boston, New York, and Chicago) are must-visit American cities for any first-timetraveller to the us.
其中三个(波士顿，纽约和芝加哥)是任何首次来美国旅行的旅客必游的城市。
3
And arguably the most useful service for the traveller, GPS tracking, will run constantly (if required) so users do not need to restart an app or piece of functionality each time they fire it up.