clamshell

名词 clamshell:

1. the shell of a clam
2. a dredging bucket with hinges like the shell of a clam
   同义词：grapple

clam.shell

n.（名词）
The shell of a clam.
蛤壳
Any of various devices with two hinged jaws, used for dredging or digging.
抓斗，挖斗：任何一种具有两个铰接夹爪用来挖泥或铲土的设备