Surface currents are influenced by tides, the rotation of the Earth, even the shape of land.

表面洋流受潮汐、地球自转甚至陆地形状的影响。

Meanwhile, in the open ocean, wind is the major force behind surface currents.

同时，在开阔的海洋中， 风是表面洋流背后的主要力量。

The strong surface currents that can carry boats and swimmers off course are probably more familiar to us, but the deep ocean is scoured by underwater currents too.

我们可能更熟悉能把船只和游泳者带离航道的强烈的表面洋流，但深海也会受到水下暗流的冲刷。

This is the genesis of ocean surface currents  which carry warm tropical water up to temperate latitudes, or cool temperate waters down to the  tropics.

这就是海洋表面洋流的起源，它将温暖的热带海水带到温带地区，或将凉爽的温带海水带到热带地区。

Surface currents travel in big gyres - think of them as these whirling circles - and they carry stuff like trash and messages in bottles around the world.

表面电流在大环流中移动——把它们想象成这些旋转的圆圈——它们在世界各地的瓶子里携带垃圾和信息等东西。