在20世纪下半叶，粮食价格经历了几次大幅上涨。

During the second half of the 20th century, grain prices rose dramatically several times.

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到19世纪下半叶，中上层阶级家庭都用上了中央供暖。

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

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19世纪下半叶，各地都建立了托儿所；大多数都是慈善性质的。

Nurseries were established in various areas during the late half of the 19th century; most of them were charitable.

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