Translation of "oceans" into Chinese

There is sand at the bottom of the ocean.

海洋底部有沙子。

Which ocean separates China and America?

中国与美国隔着哪个大洋?

No, you can't hear the ocean, but you can learn a great deal about our world.

不 , 你 不能 听到 大海 , 但 你 可以 了解 我们 的 世界 很大 。