English Dictionary

top-block

noun

(nautical) A large ironbound block strapped with a hook, and, when used, hung to an eyebolt in the cap, used in swaying and lowering the topmast.

The top block of the tower was made of solid marble.

意味（1）

(nautical) A large ironbound block strapped with a hook, and, when used, hung to an eyebolt in the cap, used in swaying and lowering the topmast.

Underneath this Cap are Eye - bolts (b) , on each side : one is for the top Block, and the foremost one for the Fore Lift Block to hook to