在过去的二十世纪下半叶开始使用。

Use began in the last half of the twentieth century.

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渐渐地，在二十世纪下半叶成员国数量增多了。

Little by little, the number increased during the second half of the twentieth century.

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这些变化不同于西方国家在二十世纪下半叶所产生的那些。

The changes are different from those that took place in the West in the second half of the 20th century.

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In the second half of the twentieth century and up now into the twenty-first century, writers were thinking very hard about what to do stylistically with all the innovations that come in that powerful period known as modernism.

自二十世纪下半叶,直至现今二十一世纪,作家都在努力思考在现代主义影响,深远的这个时期里该怎样进行文体上的创新。

耶鲁公开课 - 1945年后的美国小说课程节选