... bottom cradle 下摇架，下皮圈架 building cradle 支船架 bundling cradle 管束筐架 ...
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Building berth is the fixed ground support and launching-cradle is only used while launching. The latter will be sliding together with the ship into the water.
船台是固定的地面支撑，下水支架仅用于下水时。后者在下水时与船体一起滑入水中。
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