在水中大多数氢原子和氧原子是稳定的，但这两个元素也有微量以较重的同位素形式存在。
Most hydrogen and oxygen atoms in water are stable, but traces of both elements are also present as heavier isotopes.
其中第一个步骤就是将水分解为氢和氧，这极其困难，因为水分子非常稳定。
The first of these involves splitting water into hydrogen and oxygen, a notoriously difficult thing to do because water molecules are so stable.
当海洋变暖时，海水表面会形成更稳定的薄层，薄层会影响水面上营养物质的有效性，更让人焦虑的是，会影响到氧的使用。
Surface waters are expected to form more stable layers as the oceans warm, which will affect the availability of nutrients and, it is increasingly feared, of oxygen.
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