mainsheet

名词 mainsheet:

1. (nautical) a line (rope or chain) that regulates the angle at which a sail is set in relation to the wind
   同义词：sheet, tack, weather sheet, shroud

main.sheet

n.Nautical （名词）【航海】
The rope that controls the angle at which a mainsail is trimmed and set.
主帆帆脚索：控制能使主帆平稳或张起的角度的绳子