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。
全盛时期；鼎盛时期；壮年；精华；最佳部分；首屈一指的事物；主音；音阶的第一音；（自行车赛中的）途中冲刺；（基督教）清晨六时的祈祷时辰
a prime number; a number that has no positive divisors other than 1 and itself
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.
最繁荣或生产力最高的时期
the period of greatest prosperity or productivity
主要的或最好的个体或部分。
The chief or best individual or part.
第二个礼拜时刻；大约早上6点
the second canonical hour; about 6 a.m.
在重要性或等级上居首的事物:如一流防务公司、优质抵押贷款机构等。
Something which is first in importance or rank: a prime defense company, mortgage lender, etc.
音阶的第一个音或音调。
The first note or tone of a musical scale.
第一种防御姿势,持剑手与剑尖均与头部同高。
The first defensive position, with the sword hand held at head height, and the tip of the sword at head height.
数学结构中的素元素,特别是素数。
A prime element of a mathematical structure, particularly a prime number.
在primero游戏中包含每种花色一张牌的四张牌手牌；扑克中同花顺的反义词
A four-card hand containing one card of each suit in the game of primero; the opposite of a flush in poker.
一系列连续的棋子。六个连续的棋子可以阻止对手的棋子通过。
A series of consecutive blocks. A prime of six prevents the opponent's pieces from passing.
用于表示英尺、分钟、导数及其他度量和数学运算的符号′
The symbol ′ used to indicate feet, minutes, derivation and other measures and mathematical operations.
在十二进制系统中由十二秒组成的一英寸
An inch, as composed of twelve seconds in the duodecimal system.
来自雄鸵鸟翅膀的最浅色羽毛
A feather, from the wing of the cock ostrich, that is of the palest possible shade.
引起启动效应的刺激
A stimulus which causes priming.
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。
用法提示：prime在这里作名词，表示质数。
She was in her prime when she gave that performance.
她在那场演出时正处于全盛期。
用法提示：prime此处意为全盛时期，与in one's prime搭配表示处于巅峰状态。
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。
用法提示：prime在此指全盛期，past one's prime表示巅峰已过。
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。
heyday 多指国家、运动、流派等的兴旺时期，常用 in its heyday；prime 更强调人生中精力最充沛或事业最好的阶段。
peak 可指具体最高点或抽象巅峰，如 at one’s peak；语气比 prime 中性，不专门指人的壮年。
zenith 较正式，原指天顶，常指权力、名声或事业达到的最顶点，多用 at the zenith of ...，不如 prime 口语化。
height 常见于 at the height of ...，可表示兴旺或热烈的最高程度，适用面较广；prime 则偏重状态最佳、最有活力。
grammar · medium
易错句子He is prime now.
正确表达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。
grammar · medium
易错句子He is in prime of his life.
正确表达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。
grammar · medium
易错句子She was in her prime period in the 1990s.
正确表达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。
与 prime（全盛时期）相比，heyday 更强调某个事业、团体或时代最繁荣的一段时期，常与 of 连用；prime 则侧重个人或事物处于最佳状态，常用 in one's prime。
peak 指最高点或巅峰时刻，可以是具体的山顶或某个指标的尖峰，常用 at its peak；prime 指持续的最旺盛阶段，强调状态最佳，常用 in one's prime。
bloom 原义是开花，引申为青春、美貌、健康等最亮眼的时期，较文学化；prime 含义更广，指力量、能力、事业等方面最好的阶段。
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。
一个素数只有 1 和它本身两个因数，因数是理解素数定义的关键概念。
素数是在大于 1 的正整数范围内讨论的，整数是素数的基本范围。
一个数的倍数和因数共同体现整除关系，与素数概念密切相关。
判断一个数是否为素数，需要研究它能否被其他整数整除。
因数分解把整数拆成素数因子的乘积，是围绕素数的核心运算。
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。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY, WORDNET.