在二十世纪初，几个顶尖的物理学家。

At the beginning of the twentieth century, several leading physicists.

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在二十世纪初以前，它曾是美国最高的人造建筑。

It was the tallest man-made structure in America from its completion until the early 1900's.

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在二十世纪初，美国的生命预期是47.3岁，而在19世纪中期还不到40岁。

At the beginning of the twentieth century, life expectancy at birth in America was 47.3 years, and in the middle of the nineteenth century it was less than forty.

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So he came up with the ideas that led to the idea of Lewis structures in the very early 1900's.

他就提出了这个想法,进而发展出了路易斯结构在二十世纪初。

麻省理工公开课 - 化学原理课程节选

That civilization was uncovered by the archaeologists right at the beginning of the twentieth century.

考古学家在二十世纪初首次发现了,拥有该特征的文明

耶鲁公开课 - 古希腊历史简介课程节选

Now the master of syncopation, of course, in music was Scott Joplin, African American composer writing a lot around the area of St. Louis in the turn of the twentieth century.

说到使用切分音的大师,我们自然想到斯考特·乔普林,是位多产的美国黑人作曲家,二十世纪初居住在圣路易斯地区

耶鲁公开课 - 聆听音乐课程节选