桅杆的甲板下部斜桁的船内部分的英文

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• 桅杆:    longeron; mast; sp ...
• 的:    4次方是 The fourth po ...
• 甲板:    deck; deck armour
• 斜:    oblique; slanting; ...
• 桁:    purlin
• 船:    boat; ship; vessel ...
• 内部:    interior; inside; ...
• 分:    component