heyday [ˈheɪdeɪ]

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n.全盛时期，青春期

the most successful or popular period of someone or something

The 19th century was the heyday of steam railways. 19世纪是蒸汽机车鼎盛的时代。
She was a great singer in her heyday. 她在自己的黄金时代是个了不起的歌唱家。