These produce oil which flows along the length of the hair and the health of the root determines the overall health of the strand of hair.

这些会分泌油脂，油脂顺着头发流动，而发根的健康程度决定了该缕毛发的总体健康。

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Overall, researchers didn't find major differences between the four groups, but the length and severity of colds was slightly worse among patients who didn't receive pills.

从总体上看，研究人员并未发现这四组病人之间有重大差异，但没有服用药片的病人的感冒病程略长、病情也略为严重。

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A progress bar can set expectations for the length of process, give a preview of the overall process, and keep users informed about how far they've progressed in the prescribed flow.

进度条可以让用户预估整个流程的长度，对于全部流程有个预览，并时刻告诉他们在整个流程中已经完成多少了。

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It turns out that essentially two factors contribute to the amount of time a given physician spends with open or pending claims: the likelihood of a claim in any given year, and the overall length of the legal process.

FORBES: Medical Malpractice: Broken Beyond Repair?

They are worst off in the North West, where the average length of a healthy life is only 64.4 years, and overall life expectancy is 73.4 years.

BBC: Northerners suffer more ill health