到19世纪下半叶，中央供暖系统已出现在每个中上层家庭里。

Central heating was present in every upper-middle-class home by the second half of the 19th century.

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20世纪下半叶，随着南方地区逐渐变得工业化，原本在农场里辛勤劳作的贫穷的阿拉巴马人得以勉强跻身中产阶级之列。

As the South industrialized in the second half of the 20th century, poor Alabamians who once toiled on farms were able to secure a toehold in the middle class.

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后来，叶卡捷琳娜二世派人把琥珀屋搬到了圣彼得堡郊外她避暑的宫殿里。

Later, Catherine II, had the amber Room moved to the palace outside St Petersburg where she spent her summers.

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