The first section is the origin of the obligation of security.
第一部分，安全保障义务的溯源。
The second section is the theoretical analysis of the obligation of security.
第二部分，安全保障义务的理论分析。
This strategy reflects our most solemn obligation: to protect the security of the American people.
这一战略体现我们最为严肃的职责：保卫美国人民的安全。
This strategy reflects our most solemn obligation: to protect the security of the American people.
这一战略体现我们最为严肃的职责：保卫美国人民的安全。
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