二十世纪后半叶以来，美国的补充替代医疗得到了飞速发展。

Since the latter part of the twentieth century, there was an explosive growth in complementary and alternative medicine (CAM) in the United States.

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元学习理论活跃于二十世纪后半叶西方心理学历史舞台上的主要思潮。

Teaching Students to Learn by Themselves Theory Meta-learning Theory is the main ideological trend invigorating in the historical western psychology in the later half of 21st century.

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二十世纪后半叶之前，珠穆朗玛峰是人类望而却步的庞然大物，赫然耸立于天际，笑傲一切冒险者。

Prior to the second half of the twentieth century qomolangma was a forbidden monolith looming in the background up in the sky defying its adventure seekers.

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