Cindy教口语，“全盛时期”英语怎么说？

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Heyday
 

heyday /ˈheɪdeɪ/

n. 全盛时期，巅峰时期，年轻力壮之时
 

It refers to the period of greatest prosperity or productivity; or the time when someone is the most powerful, successful, or popular.

它指的是最繁荣时期或生产力最强盛的时期;或是指某人年轻力壮、最成功、最受欢迎的时期。
 

The 19th century was the heyday of steam railways.

19世纪是蒸汽火车的全盛时期。
 

He is sure to win the game in his heyday.

全盛时期的他，一定能赢得这场比赛。