结果表明发镧、锌、锰、铜及钙、镁含量在人群间有显著性差异。

The results showed that hair levels of La, Zn, Mn.

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目前，科学家已提出很多种可能原因，来解释为什么一年中，流感病毒在某些月份更易在人群间传播。

Researchers have come up with many possible reasons to explain why nonpandemic flu viruses take hold only at certain times of the year.

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在雪梨的邦迪中心，福特和未婚妻卡利斯塔·弗洛克哈特的出现令人群一时间不知所措。 41岁的弗洛克哈特曾出演过影集《艾莉的异想世界》（又名《甜心俏佳人》）的女主角。

Ford and his fiancee of four years, former Ally McBeal star Calista Flockhart, 41, dazzled the crowd at Bondi Junction.

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As we'll see in section today, a vaccine does not have to be totally perfect in order to prevent transmission of a disease, because when a disease enters a community its spread from one person to another.

有如我们今天看到的,疫苗不一定非要,绝对完美地阻止疾病的传播,因为当疾病侵入一个社区后,会在人群间传播

耶鲁公开课 - 生物医学工程探索课程节选