R
英 [ɑ?]
美[ɑr]
- n. 英語字母中的第十八個字母
- abbr. 電阻（resistance）；比率（ratio）；醫(yī)生處方（recipe）
詞組搭配
the R months
the months with R in their names (September to April), considered to be the season for eating oysters
R月份（指名稱帶R的月份，即九至四月，據(jù)說是吃牡蠣的季節(jié)）
the three Rs
reading, writing, and arithmetic, regarded as the fundamentals of learning
3R課程（指讀、寫、算這三種基礎(chǔ)教育）