您要查找的是不是：
- 双阶分离式BOM结构double-steps separative BOM structure
- 双阶分离式BOMdouble-layers separative BOM
- 双阶样条bi-order spline
- 双阶过载two-stage supercharging
- 双阶跃计时库仑法double potential-step chronocoulometry
- 成双atwain
- 双解bilingual
- 半双工semiduplex
- 门罗阶Monroe stage
- 双拼Two bors d's oeuveres
- 把空奶瓶放到门阶上，等送奶人来取。Put your empties on the doorstep for the milkman.
- 双元音diphthong
- 阶调contrast
- 全双工FDX
- ｎ阶n-order
- 双冠double comb (禽)
- ｎ阶矩nth moment
- 母亲给她买了一双网球鞋。Mother bought her a pair of tennis shoes.
- 比翼双飞fly wing to wing
- 双刃twolip
