Every era of history is defined by its signature challenge. For the first half of the 20th century, it was what to do about German and Japanese militarism; for the second half, it was the struggle against the Soviet Union.
每個時代都是由其標誌性的挑戰界定的。20世紀上半葉，這種挑戰是如何應對德國和日本的軍國主義；下半葉則是對付前蘇聯。
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