- screwed conduit
- spiral duct
- spiral vessels
- 螺纹: screw thread; flight; helica ...
- 导管: conduit; conduit pipe; draug ...
- 螺纹导管的小维管束: small bundles of spiral vessels
- 螺纹导程: flight lead; lead of screw thread; screw lead
- 内螺纹导程: inside lead
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