R
英 [ɑː]
美[ɑr]
- n. 英语字母中的第十八个字母
- abbr. 电阻（resistance）；比率（ratio）；医生处方（recipe）
词组搭配
the R months
the months with R in their names (September to April), considered to be the season for eating oysters
R月份（指名称带R的月份，即九至四月，据说是吃牡蛎的季节）
the three Rs
reading, writing, and arithmetic, regarded as the fundamentals of learning
3R课程（指读、写、算这三种基础教育）