... 三行铆接 treble riveting 桅支架 trestle tree 水平撑杆 triatic stay ...
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... trestle stand 栈桥 trestle tree 桅顶纵桁 trestle type column 架柱 ...
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N either of a pair of fore-and-aft timbers fixed horizontally on opposite sides of a lower masthead to support an upper mast 樯头纵材 [nautical]
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