main.sail
n.Nautical （名词）【航海】 The principal sail of a vessel.主帆：船舶主要的帆A quadrilateral or triangular sail set from the after part of the mainmast on a fore-and-aft rigged vessel.主帆：在船头船尾都装有帆的帆船上装在桅后部的呈四角形或三角形的帆A square sail set from the main yard on a square-rigged vessel.主帆：横帆式帆船上从主桅装上的方形帆
