当海洋底部开始下沉到地幔中，它会同时将整个海底板块拖拽下去。
As the ocean floor plate begins to sink down into the mantle, it would drag or pull the entire plate along with it.
最引人入胜的是海底漫步，你可以戴着潜水用的氧气头盔漫步在洋底，徜徉在珊瑚和成群的条纹鱼中间。
Most intriguing is underwater walking in which wearing an oxygen helmet you meander along the ocean bed among coral and shoals of striped fish.
现在已有足够的水深测量数据来绘制一张大西洋洋底地形图，而且我对海底地形的千变万化也有了一定的了解。
Today, enough soundings are available to enable a relief map of the Atlantic to be drawn and we know something of the great variety of the sea bed's topography.
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