1
in one's prime
prime 作名词指“盛年、全盛期”，常与 in 连用，表示“处于最活跃或最成功的阶段”。
The athlete was in his prime when he broke the world record.
这位运动员打破世界纪录时正处于他的巅峰时期。
质数；素数
primes — plural of prime
先理解核心含义，再看它在真实句子里的用法。
质数；素数
a prime number; a number that has no positive divisors other than 1 and itself
The athlete was in his prime when he broke the world record.
这位运动员打破世界纪录时正处于他的巅峰时期。
指定给这一时辰的宗教仪式。
The religious service appointed to this hour.
比赛中的中间冲刺,通常提供奖品和/或积分
An intermediate sprint within a race, usually offering a prize and/or points.
只有1和它本身的因数的数
a number that has no factor but itself and 1
最活跃、兴旺或成功的阶段或时期。
The most active, thriving, or successful stage or period.
7 is a prime, so it can only be divided by 1 and itself.
7是一个质数，所以它只能被1和自身整除。
She was in her prime when she gave that performance.
她在那场演出时正处于全盛期。
The company is past its prime and struggling to compete.
这家公司已过鼎盛期，竞争力大不如前。
prime 作名词指“盛年、全盛期”，常与 in 连用，表示“处于最活跃或最成功的阶段”。
The athlete was in his prime when he broke the world record.
这位运动员打破世界纪录时正处于他的巅峰时期。
the prime of life 强调人生中最健康、最有活力的时期。
She is in the prime of life and full of energy.
她正值人生的鼎盛时期，充满活力。
在数学中，prime 可作名词，意为“质数（素数）”，其复数形式为 primes。
Thirteen is a prime.
十三是质数。
Not this
He is prime now.
Use this
He is in his prime now.
名词 prime 表示“鼎盛时期”时，要说 in one's prime，不能直接当作形容词使用；单独用 prime 是形容词“主要的/最好的”，意思不同。
Not this
He is in prime of his life.
Use this
He is in the prime of his life.
the prime of life 是固定搭配，prime 前需要加定冠词 the；中文没有冠词概念，学习者容易漏掉。
Not this
She was in her prime period in the 1990s.
Use this
She was in her prime in the 1990s.
prime 本身已表示“最兴旺的时期”，再加 period 语义重复。中文“鼎盛时期”中的“时期”会导致学习者多加这个词。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
质数
Five is a prime number.
5是质数。
处于全盛时期；正值壮年
She was in her prime when she won the Olympic gold medal.
她赢得奥运会金牌时正值壮年。
已过巅峰时期；已过黄金岁月
The actor is past his prime, but he still gives brilliant performances.
这位演员已过巅峰期，但他的表演依然出色。
人生的全盛时期；壮年
He was struck by illness in the prime of life.
他在壮年时被疾病击倒。
处于鼎盛时期；在年富力强的时候
He won all those championships in his prime.
他在巅峰时期赢得了所有这些冠军。
过了全盛时期；巅峰已过
The boxer is past his prime but still fights bravely.
这位拳击手已过巅峰，但仍然勇敢地比赛。
生命的黄金时期；壮年
She was struck down by illness in the prime of life.
她在壮年时被疾病夺去了生命。
《布罗迪小姐的盛年》
She was a talented athlete in the prime of her youth.
她是一位才华横溢的运动员，正值青春年华。
Use primes naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
想象质数（prime number）像首相（prime minister），都是“第一”：质数是最基本的数，全盛期是最佳时期。
语域：neutral 常见场景：life stages、career discussions、sports commentary 作为名词，通常指人生或事业中精力最旺盛、成果最多的时期，常出现在 in one's prime、the prime of life 等短语中。语气中性，较常见于传记、访谈、体育评论等语境。
与 prime /praɪm/ 押韵的词包括 time、crime、lime、climb、rhyme，它们都含 /aɪm/ 音（注意 climb 的 b 不发音，rhyme 拼写不同）。但要小心 prim /prɪm/，它拼写相近却读短音 /ɪ/，并不押韵；primer 作“入门读物”时读 /ˈprɪmər/，作“底漆”时读 /ˈpraɪmər/。
Dictionary facts from ECDICT, WIKTIONARY, WORDNET.