Letter · Frequency #2620
r
R；字母R
Letter and exact-case symbols
Spoken name: ar. Scientific symbols are case-sensitive.
the letter R
Letter name · 字母名称the 18th letter of the English alphabet
英文字母 R（第 18 个字母）
Source: BridgeDict Latin alphabet catalog
ronto
SI prefix · 国际单位制词头the SI prefix ronto, representing a factor of 10^-27
国际单位制词头 ronto，表示 10^-27
Source: BIPM SI Brochure核心释义
the 18th letter of the Roman alphabet
- 1.
Rex(“国王”)或Regina(“女王”)的缩写,英国君主在其名字后签署文件的首字母
Abbreviation of Rex (“King”) or Regina (“Queen”), the initial by which a British monarch signs documents after his or her name.
Rex(“国王”)或Regina(“女王”)的缩写,英国君主在其名字后签署文件的首字母
用法In use
A small r was painted near the door.
用法提示：r 作名词，指字母符号，在被动句中作主语。
Can you write an r in one smooth stroke?
用法提示：r 作名词，指字母，作动词 write 的宾语。
My password has an r in it.
用法提示：r 作名词，指字母，在介词 in 后作宾语。
the letter r
字母r是罗马字母表中的第18个字母。
The word 'river' starts with the letter r.
单词'river'以字母r开头。
r represents radius
在数学和科学中，常用r表示半径。
In the formula, r represents the radius of the circle.
在公式中，r表示圆的半径。
相关词与表达Connections
搭配Collocations
- R and D
- 研发
- Our company invests heavily in R and D.我们公司大力投资研发。
- R-rated
- R级（限制级）
- The movie is R-rated due to violence.这部电影因暴力而被定为R级。
- the letter r
- 字母r
- The word 'river' starts with the letter r.单词'river'以字母r开头。
- R&B
- 节奏蓝调
- She loves listening to R&B music.她喜欢听节奏蓝调音乐。
- three R's
- 三R（读、写、算）
- Primary education focuses on the three R's.
学习提示Learner notes
记忆技巧Memory Tip
R的形状像一把镰刀，发音类似'啊'，需卷舌。
语境与语域Context & Register
通用
发音与拼写Pronunciation & Spelling
All listed words rhyme with 'r' in its typical pronunciation /ɑː(r)/, sharing the same stressed vowel and optional following 'r' sound.
Dictionary facts from ECDICT, WIKTIONARY, BridgeDict Latin alphabet catalog, BIPM SI Brochure.