营销者很早就明白，最有力的营销方式是人与人之间的比较。
Marketers have long known that the most powerful persuader is peer pressure.
身高主要通过家族遗传，但是科学家说，在比较人与人之间的不同之处时，这个原因并不能解释所有问题。
Height is mostly passed down through families but scientists say this does not explain everything when comparing the variations between people.
但是，人与人之间听力丧失的程度不同，那些耳朵比较强健的人与耳朵与较柔嫩的人相比，差异可达30分贝。
But the amount of hearing loss might differ by as much as 30 dB between people who had the toughest ears and those with the most tender ones — a huge variation.
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