heyday

Compared meaning: the peak period of someone's life or success (noun).

比较义项：全盛期，即人或事物处于最佳状态、最高成就或最流行阶段的时期（名词）。

• prime

  Prime is the broadest term, meaning the general peak period of a person's or thing's life, ability, or condition, without necessarily implying fame or that a decline has followed.

  prime 是这三个词中含义最宽泛的一个，指人或事物一生中状态、能力或条件最好的阶段，不一定涉及名声，也不一定暗示此后走向衰落。

  The boxer, now well past his prime, struggled to keep up with younger opponents.

  这位拳击手如今早已过了全盛期，很难跟上更年轻对手的步伐。

• bloom

  Bloom emphasizes youthful freshness, beauty, or health at their peak, and is mainly used for people's youth or vitality rather than fame, achievement, or an institution's success.

  bloom 强调青春、美貌或健康达到的巅峰状态，主要用来形容人的青春或活力，而不是名声、成就或机构的成功。

  Even in the bloom of health, she took every precaution against illness.

  即使正处于健康的全盛期，她也仍然采取各种措施预防疾病。

• heyday 本词

  Heyday refers to the peak of fame, popularity, or success, usually of an era, group, or institution, and often implies that this peak has since passed.

  heyday 指名声、流行程度或事业成就的顶峰，通常用于形容一个时代、团体或机构，并往往暗示这一巅峰已经成为过去。

  In its heyday, the mill employed hundreds of workers from the village.

  在全盛时期，这家磨坊曾雇用了村里数百名工人。

All three mean the best period of a person or thing. Prime is the most general, for people or things. Bloom stresses youth and beauty at their peak, mainly for people. Heyday stresses fame or success now past. Bloom's flower sense is not compared here.

这三个词都可以表示全盛期，但侧重点不同：prime 泛指人或事物状态最好的阶段，涵盖面最广，可用于人或物；bloom 侧重青春、美貌或健康方面达到的巅峰，多用于人的青春年华；heyday 强调名声、流行程度或事业成就的顶峰，并常暗示这一巅峰已经成为过去，多用于时代、行业或团体。这里不比较 bloom 表示花朵开放的动词义，例如樱花每年春天在公园盛开。