Oxygen is essential for the metabolic process known as cell respiration that allows cells to efficiently harvest energy from organic food.

氧气在细胞呼吸的新陈代谢过程中是必不可少的，它能使细胞有效地从有机食物中获取能量。

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Now consider what an individual cell in your body would want. It wants oxygen and sugar.

现在想想你身体里单个的细胞想要的，它可能需要氧气和糖分。

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The heart pumps blood through the arteries, capillaries and veins to provide oxygen and nutrients to every cell of the body.

砰砰跳动的心脏连接着动脉，毛细血管和静脉并提供氧气和养分给身体的每一个细胞。

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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

In the simplest terms, a fuel cell combines hydrogen and oxygen in a process that releases electricity, heat and water.

FORBES: Beltway Bet: FuelCell Energy

The methanol fuel cell uses methanol and oxygen to generate power and is one of several technologies vying to replace lithium ion batteries that are commonplace today.

BBC: NEWS | Technology | Laptops with fuel cells approach