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.
每个时代都是由其标志性的挑战界定的。20世纪上半叶，这种挑战是如何应对德国和日本的军国主义；下半叶则是对付前苏联。
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