Marine snow, detritus from the creatures swarming in the sunlit waters above.

海雪是海洋表面上的物产的小型有机物碎屑。

These commonly occur when there's severe weather over the ocean.

这是通常发在海洋上的恶劣天气。

The world's oceans are also vastly mysterious places.

世界上的海洋也是非常神秘的地方。

This is basically what happens in the ocean recreate on land.

这基本上就是在陆地上重现海洋的过程。

But the oceans of the young Earth soon faced another danger, that of freezing over.

但年轻地球上的海洋很快就面临另一种危险，那就是结冰。

But what about parts of the earth where there aren't oceans?

但地球上没有海洋的那些部呢？

Its subsurface ocean may contain more water than all of Earth' s oceans combined.

它的地下海洋所含的水可能比地球上所有海洋的总和还要多。

It may even be liquid under the surface, like the oceans of Enceladus and Europa.

它甚至可能是液态的，就像土卫二和木卫二上的海洋一样。

And coral reefs are dying around the planet because of ocean heatwaves.

由于海洋热浪，地球上的珊瑚礁正在死亡。

Zhang noted that ocean tides on Earth are affected in this way.

张指出，地球上的海洋潮汐就是这样受到影响的。

But Titan's seas and lakes are filled with liquid methane rather than water.

但是土卫六上的海洋和湖泊充满了液态甲烷而不是水。

The atmosphere will turn into a moist greenhouse, and the world's oceans will evaporate away.

大气层会变成一个潮湿的温室，世界上的海洋会蒸发掉。

This really is the ocean equivalent of a rainforest.

这里真的算得上是海洋中的热带雨林。

As ships sail across the waves, their wake stands out from the dark ocean waters.

轮船破浪行驶时，会在昏暗的海洋水域上留下鲜明的尾迹。

Lima is a city that sits on the ocean behind the Andes and the Amazonian forests.

利马是一座坐落在安第斯山脉和亚马逊森林后面的海洋上的城市。

He was very fond of flying fish as they were his principal friends on the ocean.

他非常喜爱飞鱼，拿它们当作他在海洋上的主要朋友。

But experts estimate it contains between four and 18 percent of the world's known marine species.

但专家估计，它包含了世界上已知海洋物种的4%到18%。

Similar, smaller programs were successful in the past in the ocean off the coast of New Hampshire.

类似的，规模较小的项目过去在新罕布什尔州海岸附近的海洋上也取得了成功。

More than half a million bottlenose dolphins swim in Earth's oceans and fortunately, they are not endangered!

幸运的是，地球上的海洋里仍然畅游着超过50万头宽吻海豚，它们还未面临灭绝的危险！

When talking about some of the deepest parts of the world's oceans, much is still not known.

当谈到世界上一些海洋的最深处时，很多事情仍然是未知的。