heyday

名词 heyday:

1. the period of greatest prosperity or productivity
   同义词：flower, prime, peak, bloom, blossom, efflorescence, flush

1. "In his heyday, he was a great tennis player."
   ＂他年轻力壮时，是一位了不起的网球运动员。＂
2. Steam railways had their heyday in the 19th century.
   19世纪是蒸汽机车的全盛时期。

hey.day

n.（名词）
The period of greatest popularity, success, or power; prime.
极盛时期：繁荣、成功或力量的最高潮；全盛时期

来源：
Perhaps alteration of heyda [exclamation of pleasure]
可能为 heyda的变化 [欢呼]
probably alteration of Middle English hey [hey]
可能为 中古英语 hey的变化 [嘿]