6000 meters is the average depth of the oceanic crust beneath the ocean floor.

6000米是大洋底下的海洋地壳平均深度。

Okay, going deeper still, and at 12, 100 ft we reach the average depth of the World Ocean.

好了，再往深处走，在 12100 英尺处就是世界海洋的平均深度。

Down at 4, 267 meters is the average depth of the ocean where you would normally expect to hit the floor.

4267 米深处是海洋的平均深度，你通常认为这个深度就到海底了。

Besides, I use my supplementary ballast tanks only to reach an average depth of 1,500 to 2,000 meters, and that with a view to conserving my machinery.

另外，只是要到一千五百和二千米的中等深度时，我才使用那些补充储水池，这是为了爱护我的机器，小心使用它。

Since the ocean covers about 70 percent of Earth's surface, and has an average depth of about 3.7 kilometers, that's quite a lot we haven't explored!

由于海洋覆盖了地球表面约 70%，平均深度约为 3.7 公里，因此我们还没有探索过很多海洋！