据个人经验，这是我们需要反复学习的东西，尤其要注意成本在量上的增加。

In my experience, this is something we have to learn over and over again, especially as the size of the costs increases.

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我下决心要更努力学习，并且减少喝咖啡的量。

I resolved to study harder and cut down on the amount of coffee I drink.

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较低量接触可降低其智商评分，引起学习障碍、学习成绩不良以及暴力行为，所有这些可促使终生减少收入。

Relatively low levels of exposure can reduce their IQ scores, cause learning disabilities, poor school performance, and violent behaviour, all of which may contribute to reduced lifetime earnings.

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