Sea mounts are underwater hills or mountains whose summits are below the ocean surface.

海山是指山峰低于海面的水下山丘或山脉。

What we've got here are two coral reefs that researchers just discovered along with two sea mounts they've never explored.

我们这里有两个研究人员刚刚发现的珊瑚礁以及两个他们从未探索过的海山。