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main upper topsail /ˈmeɪn ˌʌpə ˈtɒpseɪl/ n

中文：主上中桅帆

中文 · 主上中桅帆Español · gavia mayor altaFrançais · grand hunier volant avant
Meaning：Square sail between the main lower topgallant sail and the main lower topsail.
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Four-masted ship sails

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