They take in water and extract the dissolved oxygen which fuels their cells.

它们吸入海水，然后提取溶解在其中的氧气来让自己的细胞正常运作。

One more detail bears mentioning: that is the warmer water also holds less dissolved oxygen.

水温升高会导致水中的溶解氧含量减少。

All the creatures that consume oxygen keep consuming it, and the overall amount of oxygen dissolved in the water becomes critically low.

消耗氧气的所有生物会继续消耗氧气，而水中溶氧总量会急剧减少。

The jellyfish's outer layer of cells, called the ECTODERM, is so thin that oxygen dissolved in the water can simply diffuse right through it.

水母的外胚层细胞非常薄，溶解在水中的氧气可以直接穿过它。