At one time the continent will sink, and the nodule resume its journey over the deep-sea plains, toward its starting point.

某—天大陆会降沉，而金属核却又踏上了跨越深海平原，回归到出发点的旅程。

youdao

Definition: travelling long distances over land and sea rather than by plane, especially because you are concerned about the environment or because you want to spend time enjoying the journey.

定义：在陆地和海上进行长途旅行而非乘飞机，尤其是因为你关心环境或者因为你想慢慢享受旅行。

youdao