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- 四four
- 四RFour Rs
- 四个tetrad
- 四年four years
- 她说话带着乡下人的轻柔的r音。She speaks with a soft rural burr.
- 四级four-stage
- 四国Shikoku
- R-SBFR-SBF
- R&D资金research and development fund
- 四大the four elements [earth, water, fire, wind]
- R&D合作R&D cooperation
- 四部four-part
- 空间E-R模型Spatial E-R model
- 四处all over the place
- 厚向异性系数rcoefficient of normal anisotropy r
- 四倍fourfold
- (R)-2-三甲基硅-2-羟基丙腈( R )-2-trimethylsilyl-2-hydroxyl-ethyleyanide
- 四舍五入round
- 四角foursquare
- 四叶草clover