The brain requires a constant supply of oxygen.

大脑需要持续的供氧。

《柯林斯英汉双解大词典》

You may need to wear a device while sleeping that delivers a constant stream of air to your nostrils through a small hose, preventing the dangerous interruptions in oxygen.

那样的话你可能在睡觉时需要带一种设备通过软管向你的鼻孔里传送空气，以避免你呼吸暂停。

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Results show that influent load, calibrated parameters related to oxygen transfer efficiency and thickening constant of final clarifier have greater effect on optimal design.

灵敏度分析结果表明，对优化设计影响较大的参数为：进水水量水质、与氧转移效率相关的校正参数以及二沉池的浓缩常数等。

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She also needs a constant supply of oxygen.

BBC: NEWS | Health | Don't let baby die, pleads father

She had no firsthand knowledge of what it was like to feel your breath being squeezed off, to live in a world whose very atmosphere was a constant taunt, whose bountiful oxygen was as capriciously out of reach as a rainbow.

NPR: In 'Challenger Park,' Mom Is an Astronaut