主上桅顶帆
/ˈmeɪn ˌʌpə ˈtɒpɡalənt ˈseɪl/
n
English: main upper topgallant sail · 主上桅顶帆
English · main upper topgallant sailEspañol · juanete mayor proel altoFrançais · grand perroquet volant avant
释义：Square sail under the main royal sail.