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oxygen

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You breathe less when you sleep, so you get less oxygen.(你睡觉时呼吸更少，所以你得到的氧气更少。)
The higher one climbs, the less oxygen there is in the air.(爬得越高，空气中的氧气就越少。)
If headaches only occur at night, lack of fresh air and oxygen is often the cause.(如果头痛只发生在晚上，缺少新鲜空气和氧气常常是其原因。)
Water is a compound containing the elements hydrogen and oxygen.(水是含有氢元素和氧元素的化合物。)
A lack of oxygen may inhibit brain development in the unborn child.(缺氧可能阻碍胎儿的大脑发育。)
Water can be resolved [decomposed] into hydrogen and oxygen.(水可分解为氢和氧。)
Burning fossil fuels uses oxygen and produces carbon dioxide.(燃烧化石燃料消耗氧气并产生二氧化碳。)
The brain requires a constant supply of oxygen.(大脑需要持续的供氧。)
Oxygen has high reactivity.(氧的反应性很高。)
Ozone is a highly reactive form of oxygen gas.(臭氧是一种高度活跃的氧气形态。)

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