1. If you're in a country where security is a concern, stick to hotel taxis,
    如果你是在一个要担心安全的国家旅游，那就坚持用宾馆的出租车。

2. For instance, Mexico City has a three-level system for identifying taxis.
    比如，在墨西哥城辨认出租车有一个三级体系。