with repeated exposure over time, you cross that threshold, and your body reacts.

但反复长时间暴露在这些过敏原中，你便超越了那个界限，身体便会有所反应。

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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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While cross-marketing is a good way of increasing exposure, at some point, someone will have to put up the dollars for this site to continue.

虽然交叉推广是一个很不错的增加知名度的方式，但是依然会有人继续砸钱在网站上打广告。

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According to a Swiss National Bank report in May, UBS and Credit Suisse had about 3% of their cross-border exposure in Ireland, Italy, Portugal, Spain and Greece, as of 2010.

WSJ: Bank Woes Take Center Stage: SNB Reports Dollar Borrowing; UBS, Credit Suisse Deny Tapping Facility

The scale of how much money American banks have at risk in the eurozone comes from a new BIS table of the actual and potential exposure of banks to most economies via cross-border loans and financial transactions.

BBC: Eurozone woes are US woes

Convertro tackled that problem and figured out how to link purchases on one computer to their initial exposure, then applied that to going cross-device with mobile phones, where the need is great for one recent campaign in major league sports, Zwelling says, mobile drove 40% of traffic but only earned 5% of its actual conversions.

FORBES: From iPhone To Mac, Convertro's Data Matches Where You See It To Where You Buy