【机】 Archimedean screw
helix; screw; spiral; spire; volution
【化】 helix
【医】 coil; coiling; helico-; screw; spiral; spiro-; tirefond
catchment; drain; drainage
【医】 drain; drainage
chance; crucial point; engine; machine; occasion; organic; pivot; plane
flexible
【医】 machine