1. 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.
    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。

2. That a series of deep soundings was obtained in the Atlantic and the first samples were collected by dredging the bottom.
    才在大西洋测得一个海水深度，同时通过挖掘海底，取得了研究海底的首批样品。