之所以很难把两种假说分辨开来，是因为质量不一的观测带来了数据中的虚假信号。
Part of the reason it's so difficult to tell these two scenarios apart is that spotty observations make fake signals in the data.
她说：“我见过非常昂贵的蛋白质补充剂，它们声称质量上乘，但它们可能不一定对达到平均健康的成年人有好处。”
"I've seen very expensive protein supplements that claim to be high quality but they might not really be beneficial for the average healthy adult," she says.
公司的老字号并不一定能保证质量。
A famous old name on a firm is not necessarily a guarantee of quality.
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