What ' s the difference between building - berth and launching - cradle 船台和下水支架有什么区别？
2.
Building berth is the fixed ground support and launching - cradle is only used before 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用。后者在下水时与船体一起滑入水中。
