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Former Secretaries of State Discuss National Security

2015-02-01来源:VOA
Words in This Story

calculation – n. careful thought and planning that is done usually for selfish reasons

alter – v. to change (something)

avow – v. to declare or state (something) in an open and public way

context – n. the words that are used with a certain word or phrase and that help to explain its meaning

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