年代 (nián dài) means “a decade of a century (e.g. the Sixties); age; era; period”. It is an HSK 5 Chinese word in the HSK 3.0 vocabulary.
Measure word: 个
这座建筑是上个世纪30年代建造的。
Zhè zuò jiànzhù shì shàng gè shìjì sānshí niándài jiànzào de.
This building was constructed in the 1930s.
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