A projecting beam or spar run out from the side of a vessel to help in securing the masts or from a mast to be used in extending a rope or sail.是什么意思_A projecting beam or spar run out from the side of a vessel to help in securing the masts or from a mast to be used in extending a rope or sail.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句