Advertisers are skillful at creating the impression of loudness through their expert use of such factors.

广告商专业地运用这些因素，巧妙地制造响亮的效果。

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For instance, I know a capable company boss, who is also an expert in private cars and very skillful at changing car oil, even more efficiently than a mechanic.

例如，我认识一位出色的公司老板，他很爱车，并精通如何给汽车换油，甚至比专业技工还快，但是他自己的车，大部分时间，还是开到专业车店去换油。

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