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- 四four
- 弯轴飞行器压力中心的计算Center of pressure calculations for a bent-axis vehicle
- 大模数少齿数螺旋齿面的四轴加工与仿真Four-axis Milling and Its Simulation of Helicoid Gear Surface with Large Module and a Few Teeth
- 轴axis
- 四个tetrad
- 四年four years
- 四级four-stage
- 联轴器shaft joint
- 四国Shikoku
- 轴向axial direction
- 四大the four elements [earth, water, fire, wind]
- 轴的axile
- 四部four-part
- 销轴pin roll
- 四处all over the place
- 同轴电缆coaxial-cable
- 四倍fourfold
- 横轴cross shaft
- 四舍五入round
- 半轴semiaxis