These rolls are corrugated cylinders, usually of the spiral type.

粉碎辊是波纹式滚筒，还常是螺旋割纹式。

youdao

These rolls are corrugated cylinders, usually of the spiral type .

粉碎辊是波纹式滚筒，还常是螺旋割纹式。

youdao

And take use of spiral type of four position automatic switch cutter frame system.

采用螺旋型四工位自动转位刀架系统。

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" He adds a bit later: "That we live in a large spiral galaxy with very little central stellar bulge and a modest central black hole may be a clue to the type of galaxies best suited to life: ones that did not spend their pasts building colossal black holes and fighting the demons unleashed in the process.

WSJ: Book Review: Gravity's Engines