The genealogy of the H1N1 virus family would explain why exposure to a swine lineage via the 1976 vaccine or to older human lineages offers cross-protection against the new strain.

H1N1病毒的家族谱系能够解释，为什么注射过1976年疫苗或者接触过较早人类流感病毒会对新病毒起到交叉预防作用。

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By analyse structure's strain, we can gain lots of information including the danger cross section and fatigue level. Also we can estimate the structure's life.

通过对结构应变进行分析，可获取结构的危险截面和疲劳程度等信息，并可对结构的寿命进行估计。

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W025 is a new rice strain developed from chemical inducement and cross breeding. It has a giant embryo that is controlled by a single recessive gene.

W025是通过化学诱变和杂交选育而成的水稻新品系，具有巨胚特征，遗传分析表明巨胚基因受单隐性基因控制。

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But it could turn out to be a mutation or cross strain of one or several coronaviruses seen in cows, birds and pigs.

FORBES: Veterinarians Versus SARS

This means that Dr Meredith's method can reach back into the distant past, and catch a glimpse of the act of cross-fertilisation between two different varieties of grapevine that created the strain that the cuttings have perpetuated.

ECONOMIST: Genetics

Depending on the severity of your arthritis or past injury, you could consider cross training in addition to jogging to get in shape for the 10K without putting too much strain on your knee.

CNN: Will jogging hurt an obese person's joints?