这也可能包含可选的便利服务是动力天窗，DVD娱乐系统和导航系统。

Optional amenities that can also be included are a powered moonroof, DVD entertainment system, and a navigation system.

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这是因为，旅行社往往提供了很多便利服务；此外，他们的机票还可以打折。

This is because travel agencies usually provide a lot of convenience, and what's more, they can give a good discount on the air fare.

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近年来，社区便利店的生意重新兴旺起来，这主要是因为我们中的很多人实在是没有时间逛街购物，因而需要这种便利服务。

In recent years, there has been resurgence in the corner store business, mainly because many of us are so short of time, and need this convenience, when we go shopping.

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