- helical oil groove
- spiral oil grooves
- 螺旋: corkscrewspin; screw; spiral ...
- 油槽: oil groove
- 螺旋形油槽: helical oil groove
- 左旋油: laevorotatory oil
- 油槽: channel for oiling; grease groove; oil baths; oil channel; oil duct; oil groove; oil pocket; oil pot; oil receptacle; oil slot; oil space; oil sump; oil tanker; oil trough; oil well; oilwell; petroleum tank; tank truck
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