rock brake

rock-brake的词性：
n.（名词）

1. Any of several ferns of the genus Crytogramma that usually grow in rocky ground and have compound fronds and podlike fertile leaflets.
珠蕨属：任一种通常生长在岩地上的珠蕨属 蕨类植物，长有复叶和豆荚状能结果的小叶