For Kendler, there is a clear, bright line between normal grief and clinical depression.

对肯德勒而言，普通的悲痛和临床上的抑郁症之间有着明确而清晰的分界线。

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One drug is based on a line of peptides he calls mitochines, which decrease with age in the normal population, but not as much among centenarians.

一种药物是基于他称作mitochines的多肽链研发的，它在普通人群中随着年龄增长而减少，但在百岁老人中减少有限。

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It is normal if two hands are in a line and perpendiculars to the floor.

标准姿势就是两只手在一条直线上与地面成直角。

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But notice, that extra tail of a line crosses the entire range of background radiation on Earth, what is considered normal, what humans and every other life form has lived with long before we split the atom.

FORBES: Fear Of Radiation -- It's All In The Noise