Heavier isotopes tend to be left behind when water evaporates from the ocean surfaces, the remaining ocean water becomes progressively enriched in oxygen 18.

当水从海洋表面蒸发时，往往会留下较重的同位素，所以剩余的海水会逐渐富含氧18这种同位素。

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When scientists did find multicellular organisms, they assumed that they'd sunk from oxygen-enriched waters.

而当科学家们确实在深海发现这种多细胞有机生物时，他们曾猜想这些生物是从富氧水域沉降而来的。

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It is important to note that fire chemistry starts to change in oxygen-enriched environments.

在富氧环境里起火的化学性质开始变化，注意到这一点是很重要的。

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He enriched the oxygen or the carbon dioxide in the air breathed by experimental subjects and found not a hint of suppression or exacerbation of yawning compared with control subjects breathing normal air.

WSJ: Matt Ridley on Why You Just Yawned | Mind & Matter

Our sun is enriched with heavy elements, with metals, and oxygen, and so forth, that have to have been made inside another star that died before our sun and our solar system formed.

NPR: What Makes Our Solar System Special?