在上世纪六十年代前美国高等寄宿学校里学会这种口音。

Pick it up at a top boarding school in America before the 1960s.

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而在上世纪30年代和40年代的美国，他作为美国航空和火箭技术的先驱，即使没有如此公开地受到颂扬，也依然是[美国]的宝贵人才。

if not so publicly celebrated, as a pioneer in American jet and rocket technology.

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事实上，美国艺术自上世纪初就以重要的方式发生变化。

Actually, American art had been changing in important ways since the beginning of the century.

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IT基础架构维保服务行业始于上世纪中期的美国。

IT Infrastructure Maintenance services industry began in the last mid-century in America.

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根据上世纪四十年代美国一首著名的民间诗歌改编的故事。

Presents the traditional version of a famous American folk poem first heard in the u.

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到上世纪50年代末，通用汽车已经占据了美国汽车市场的半壁江山。

By the late 1950s, GM alone had 50% of the U. S. auto market.

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在上世纪90年代的美国，这类研究很流行。

This type of research became very popular in the United States in the late 1990s.

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在上世纪90年代的美国，这类研究很流行。

This type of research became very popular in the United States in the late 1990s.

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