副撑臂
转帆索

Counterbrace \Coun"ter*brace`\, v. t.
1. (Naut.) To brace in opposite directions; as, to
counterbrace the yards, i. e., to brace the head yards one
way and the after yards another.

2. (Engin.) To brace in such a way that opposite strains are
resisted; to apply counter braces to.