我们镇上的工业污染应该已经把学生们变成了活生生的科学实验品，他们每天都要吸入相当于实验室含量的锰、铬和镍等重金属。

Industrial pollution in our town had supposedly turned students into living science experiments breathing in a laboratory's worth of heavy metals like manganese, chromium and nickel each day.

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因此，科学家设计了一个实验来测定这些分子的含量，这样就可以利用血样来推测某人的年龄。

So scientists devised a test to measure the molecules-and use that to infer someone's age based on his or her blood.

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研究人员还考察了实验组的书写语言特征是否会引起胆固醇含量的下降。

The researchers also examined whether linguistic features of the experimental group's writing affected cholesterol reduction.

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