Modern frontier education includes frontier national education, frontier political education and common sense education which is for the common people.

近代边疆教育包括边疆民族教育、边政教育及面向国民的边疆常识教育等三个层面。

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And in the past five years, maritime border crossings into the United States have become a "new frontier, " said David Shirk, a professor of political science at San Diego State University and an expert on Mexico and border security.

CNN: Mexico: Traffickers abandoning immigrants at sea

"Our reading habits online encompass everything we're thinking about, political and religious views, health and relationship problems, " said Peter Eckersley, a senior technologist at the Electronic Frontier Foundation, a privacy-advocacy group.

WSJ: 'Like' Button Follows Web Users