当志愿者在正常的空气中、纯氧的环境下，或者混有超过正常的二氧化碳含量的空气中呼吸时，他们被要求要想着打哈欠。

Volunteers were told to think about yawning, while they breathed either normal air, pure oxygen, or an air mixture with an above-normal level of carbon dioxide.

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当志愿者在正常的空气中、纯氧的环境下，或者混有超过正常的二氧化碳含量的空气中呼吸时，他们被要求要想着打哈欠。

Volunteers were told to think about yawning while they breathed either normal air, pure oxygen, or an air mixture with an above-normal level of carbon dioxide.

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肥胖症的定义为体重严重超过正常的状况。

Obesity is defined as a condition of being significantly overweight.

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You're taking a normal gene and you're over expressing it or expressing it more abundantly than normal in one particular spot of the body to have an effect.

我们在讨论一个正常基因的过表达,也就是在体内某一点的表达量,大大超过正常水准从而产生疗效

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