您要查找的是不是：
- 角angle
- 三角(n) a triangle
- 半角DBC case
- 圆弧circular arc
- 海角cape
- 她说话带着乡下人的轻柔的r音。She speaks with a soft rural burr.
- 右上角top right corner
- R-SBFR-SBF
- 倒角chamfer angle
- R&D资金research and development fund
- 圆弧面crown face
- 左上角top left corner
- R&D合作R&D cooperation
- 空间E-R模型Spatial E-R model
- 六角sexangular
- 厚向异性系数rcoefficient of normal anisotropy r
- 右下角lower right corner
- 四角foursquare
- （R）-2-三甲基硅-2-羟基丙腈( R )-2-trimethylsilyl-2-hydroxyl-ethyleyanide
- 全角SBC case
