确切地说,它是一个大陆块.

Antarctica is an actual land mass.

大陆块体正在被侵蚀.

The continental masses is being eroded.

随着温度的下降，第一个冰河大陆块形成了，海洋变冷了，气候模式的季节变化开始了。

With temperatures dropping, the first ice caps formed, the oceans cooled, and seasonal changes in weather patterns began.

在这个地带的低处是很长的一段尾沙地段，基本上可以断定这个地段是大陆块体上侵蚀下来的物质被水冲到深水处形成的。

And near its lower reaches there is a long tailing-off which is almost certainly the result of material transported out to deep water after being eroded from the continental masses.