The viruses kept in Containment Level Four laboratories are among the most infectious.

保存在“四级防护”实验室中的病毒都属于最具传染性的病毒。

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In Britain, there are 15 "Containment level Four" laboratories, the maximum biosecurity level, across the country.

英国拥有15所“四级防护实验室”，即最高生物安全级别实验室。

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The viruses kept in Containment Level Four laboratories are among the most infectious. Just a few of the tiny organisms are needed to cause disease.

保存在四级防护实验室的中的病毒都属于最具传染性的病毒。

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In late March, Tepco said readings of airborne radiation inside the containment vessel at the No. 2 reactor had surged to a deadly 79 sieverts, the highest level since the crisis began March 11 last year.

WSJ: New Leak at Japan Reactor Threatens Ocean