It is thought that high levels of fat raise the odds of the arteries clogging up, cutting the flow of blood and oxygen.

高水平的脂肪含量会使得动脉更易堵塞，并降低了血液与氧气的流动。

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Three hundred million years ago, dragonflies and millipedes grew to frankly disturbing sizes - thanks in part to levels of oxygen in the atmosphere as high as 30 per cent.

三亿年前，蜻蜓和蜈蚣长得惊人的巨大，一部分原因是因为空气中的含氧量高达30%。

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This type of water comes from underground sources and has low levels of oxygen, yet high amounts of sulphur and other dissolved chemicals.

这类水来源于地下水源，含氧量很低，还含有大量硫和其它化学物质。

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High levels of domoic acid in the sardines may have worsened the effects of oxygen loss in the water as the fish crowded into a limited space.

VOA: special.2011.03.15

Some neonatal intensive-care units (NICUs) are cutting back on the high levels of oxygen traditionally given to premature babies.

WSJ: How Hospitals Save More Lives and Reduce Infections in Premature Babies