launching cradle

基本解釋

What's the difference between building-berth and launching cradle?
船臺和下水支架有什么區(qū)別？
Building berth is the fixed ground support and launching-cradle is only used before launching.
船臺是固定的地面支撐，下水支架僅用于下水時用。
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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.
船臺是固定的地面支撐，下水支架僅用于下水時。后者在下水時與船體一起滑入水中。