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极速前进第二十一季

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

　　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

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

　　Melvyn Bragg explores the relationship, from 1911 to 2011, between class and culture.