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The Amazing Race 20 is the twentieth installment of the reality television show The Amazing Race. Th

　　National Geographic goes inside the operations of Customs and Border Protections and Homeland Secu

　　人类最伟大的工程壮举往往是最强大的武器。直升机、隐身技术、枪、炸弹、飞机等,这些都是战斗工具。它们甚至还为战场上的胜利提供了关键性的优势,本节目将带观众深入了解最伟大的军事工程创举……了解它们的运

　　The Amazing Race 20 is the twentieth installment of the reality television show The Amazing Race.

极速前进第二十一季