caddis worm 也作 caddice worm

caddis-worm的词性：
n.（名词）

1. The aquatic, wormlike larva of the caddis fly, enclosed in a cylindrical case covered with grains of sand, fragments of shell, and other debris.
石蚕：水生的，石蚕蛾的蠕虫状幼虫，包在被沙粒、卵壳碎片以及其它碎片盖住的柱形盒内