2. Wearables typically fall into three categories: complex devices such as fitness trackers; smart accessories such as smart watches, defined by their ability to run third-party applications; and fully autonomous smart wearables that connect directly to the Internet, such as Google’s Glass headset.
3. Most of those surveyed for the report mentioned that positive impacts of social media include socializing with acquaintances and taking in more information.
4. n. 声明，陈述
5. Switzerland debuts as the No. 1 Best Country in 2017. The country, well-known for its history of neutrality, ranks No. 3 in Open for Business and No. 3 in Citizenship.