knurling

1.(树木等的)硬节,瘤

2.小的隆起物;金属表面上的小粒;(硬币边上的)小凸边压花;【机】压花,滚花

3.(打字机上使滚筒转动的)圆形按钮[旋钮]

4.〈英〉矮小结实的人

1.在(硬币等的边上)作小凸边;【机】在...上滚花

1.a small hard knob or protuberance

2.a ridge, especially one in a series that runs along the edge of something such as a thumbscrew that makes it easier to grip

1.to put ridges on something, especially to make it easier to grip