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cardinal + n.
cardinal作为形容词，强调根本性或重要性。
a cardinal rule
一条主要规则
红衣主教
cardinals — plural of cardinal
先理解核心含义，再看它在真实句子里的用法。
红衣主教
a high-ranking bishop in the Roman Catholic Church who elects the Pope
a cardinal rule
一条主要规则
由教皇任命的罗马天主教会官员之一,仅次于教皇,与宗主教平等,组成选举教皇的特别会议
One of the officials appointed by the pope in the Roman Catholic Church, ranking only below the pope, equal to the patriarchs, constituting the special college which elects the pope.
圣路易斯红雀队的球员
A player on the St. Louis Cardinals team.
斯坦福大学运动队的球员
A player on a sports team at Stanford University.
各种新大陆雀形目鸣禽,属于红雀属或更广泛的红雀科,或外观相似曾被认为与前者有关；因其红色羽毛而得名
Any of various species of New-World passerine songbird in the genus Cardinalis, or in the family Cardinalidae more generally, or of similar appearance and once considered to be related to the former; so called because of their red plumage. (See Wikipedia article for taxonomical information.)
The cardinal led the service at the cathedral.
红衣主教在大教堂主持了礼拜仪式。
A cardinal landed on the bird feeder in our garden.
一只红衣凤头鸟落在我们家花园的喂鸟器上。
Patience is a cardinal virtue in teaching.
耐心是教学中的一项基本美德。
cardinal作为形容词，强调根本性或重要性。
a cardinal rule
一条主要规则
cardinal作为名词指天主教的高级神职人员。
The pope elected him cardinal.
教皇选他为红衣主教。
cardinal作为不可数名词指鲜红色。
She was dressed in cardinal.
她穿着鲜红色衣服。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
成为红衣主教
He became a cardinal at the age of 50.
他在50岁时成为了红衣主教。
红衣主教的帽子
The cardinal's hat is bright red.
红衣主教的帽子是鲜红色的。
鲜红色
The color cardinal is often used in ceremonial robes.
鲜红色常用于礼仪长袍。
雄性红雀
The male cardinal has bright red feathers.
雄性红雀有鲜红色的羽毛。
红雀的歌声
I heard a cardinal's song in the garden.
我在花园里听到了红雀的歌声。
大罪；严重错误
In this company, missing a deadline is a cardinal sin.
在这家公司，错过截止日期是严重的错误。
基本原则；最重要的规则
The cardinal rule of investing is to diversify your portfolio.
投资的基本原则是分散投资组合。
基数
One, two, three are cardinal numbers.
一、二、三是基数。
Use cardinals naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
红衣主教（cardinal）穿红袍，红色（cardinal）是主要颜色，记住“主红”二字。
[正式] 多用于天主教语境，如教会、教皇选举等宗教场合。
The words 'marginal' and 'nominal' rhyme with 'cardinal' (same stressed vowel /ɑː/ and ending -inal). 'Ordinal', 'criminal', 'terminal', and 'original' share the spelling -inal but differ in vowel quality (ɔː, ɪ, ɜː, ə) and/or stress pattern.
Dictionary facts from ECDICT, WIKTIONARY, WORDNET.