Cindy教口語，“全盛時期”英語怎么說？

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Heyday
 

heyday /?he?de?/

n. 全盛時期，巔峰時期，年輕力壯之時
 

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

它指的是最繁榮時期或生產力最強盛的時期;或是指某人年輕力壯、最成功、最受歡迎的時期。
 

The 19th century was the heyday of steam railways.

19世紀是蒸汽火車的全盛時期。
 

He is sure to win the game in his heyday.

全盛時期的他，一定能贏得這場比賽。