The thread of abraded unequal spiral shifting roller is actually a "uniform increasingly dispersing-ratio spire".
经过磨损的不等距螺旋输送辊的螺纹是一条“等变距螺旋线”。
There exists a spiral clearance space in the API round thread casing joint which is effected by the thread tolerance ranges.
API套管圆螺纹自身存在牙间间隙，并形成螺旋状空间间隙带。
Something, such as the thread of a screw or the spiral condenser in a still, that resembles a worm in form or appearance.
状的物品某物，如螺旋线或蒸馏器的螺旋冷凝器，在构成或外表上像蠕虫。
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