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臂的旋转轴可通过已经由框架连接的桅 杆支撑。
The rotation shaft of the arms can be supported by masts which hare connected by a frame.
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桅栓：方木条，用来支撑中桅。
A square bar used as a support for a topmast.
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桅栓：方木条，用来支撑中桅。
A square bar used as a support for a topmast.
youdao