由于眩晕、虚弱和注意力减退，他感到车子急速地朝旁边的栏杆和树林边滑去。

Dizzy, weak, his concentration fading, he felt the van slide straight for the rail and the woods beyond.

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当我们被逼着读一段或两端书的时候，我们的注意力就会减退。

We live in an age when peoples' attention wanes when they have to read more than a paragraph or two.

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多巴胺被认为是“快乐激素”，产生喜悦感；去甲肾上腺素类似于肾上腺素，导致心跳加速和兴奋感，据来自美国罗格斯大学的人类学家，著名的爱情研究者Helen Fisher所说，这两种化学物质共同引起喜悦感，充沛的精力，失眠，强烈的愿望，食欲的减退和集中的注意力。

Dopamine is thought to be the "pleasure chemical, " producing a feeling of bliss. Norepinephrine is similar to adrenaline and produces the racing heart and excitement.

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