Something in addition to the iron on Earth's surface must have absorbed much of the oxygen produced by plant life.

除了地球表面的铁以外，一定有什么东西吸收了植物产生的大量氧气。

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One of the limiting factors in human physical performance is the amount of oxygen that is absorbed by the muscles from the bloodstream.

限制人体体能表现的因素之一是肌肉从血液中吸收的氧气量。

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Such water would be useless in improving physical performance, however, since the only way to get oxygen into the bloodstream so that it can be absorbed by the muscles is through the lungs.

然而，这样的水对提高身体机能毫无用处，因为只有通过肺部才能将氧气吸入血液，从而被肌肉吸收。

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Heat also increases how well the drug is absorbed into the cancer cell and increases oxygen levels in the tumour which makes chemotherapy more effective.

BBC: 'Heat treatment' for breast cancer