vertical curved blade turbine impeller
backward-curved-blade fan
curved blade
挖掘刀
弯刀齿耙
弯曲叶片
曲线尖轨
弯叶片
弯叶栅
叶片弯曲
叶片
cuticle curved blade scissors
forward curved blade fan
conduction-cooled turbine blade
Four-Pitched-Blade Turbine
groove cutter for root of turbine blade