cylindric

Leaf blade leathery; pistillode conic to cylindric; drupes indehiscent, enclosed by persistent calyx lobes.

叶片卵到近圆，先端钝，短渐尖，或骤尖；瘦果宽卵或近球，略带紫色点或瘤状。

In this paper,a new small-sized bit is introduced.The bit is mainly composed of a biassed polyconic cutter,a cylindric roller and two bit legs.

文章介绍了一种新型小尺寸钻头，它主要由一个偏置多锥牙轮和一个圆柱滚轮及两个牙掌组成。