oxygen is present
有氧气存在
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Oxygen is present in the air.
氧存在于空气中。
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Oxygen is present in the bloodstream.
氧气存在于血管中。
They are produced in the body when too much oxygen is present.
他们在身体中存在过多的氧气的时候产生。
Light at a specific wavelength is beamed into the brain, and the oxygen present will absorb some of that light.
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