There is no virus definition database that needs to be updated regularly, no subscription, and no service agreement.
没有病毒定义数据库，需要定期更新，没有订阅，没有服务协议。
In the latter case we don't have an opportunity to build up any immunity beforehand because it's, by definition, a new virus.
在近期的病例中我们没有机会提前建立任何免疫系统，因为从理论上来讲它是一种新的病毒。
New diseases are, by definition, poorly understood when they emerge, and this is most especially true when the causative agent is an influenza virus.
从定义上讲，人们对新出现的疾病了解很少，从病原体是流感这一点上可以看到这一点。
Definition: dengue fever is caused by dengue virus, according to an acute mosquito-borne diseases.
定义：登革热是登革热病毒引起、依蚊传播的一种急性传染病。
Biological weapons, by definition, are any infectious agent, such as a bacterium or virus, used deliberately to inflict harm on soldiers and civilians alike.
从定义来看，生物武器是指任何蓄意用来伤害士兵和老百姓等的传染手段，如细菌或病毒等。
Definition: AIDS, the English transliteration of the acronym AIDS, was infected with the human body, "human immunodeficiency virus" (HIV), also known as a result of HIV infection.
定义：艾滋病，英语缩写AIDS的音译，是人体感染了“人类免疫缺陷病毒”(HIV)又称艾滋病病毒所导致的传染病。
Back in the real world, Fred Cohen presented the first rigorous mathematical definition for a computer virus in his 1986 Ph. D. thesis.
回到现实世界，佛瑞得·科恩在他1986年的博士论文中第一次提出了计算机病毒的严治数学定义。
But for those brought up on a textbook definition of what a virus is, it is still a bit of a shock.
但是对于给教科书中病毒下定义的人来说，还是挺震惊。
The transmission of the virus meets the WHO's technical definition of a Phase Six outbreak, the highest possible.
该病毒的传播已经符合世卫组织流感预警机制的最高级，第六级。
The transmission of the virus meets the WHO's technical definition of a Phase Six outbreak, the highest possible.
该病毒的传播已经符合世卫组织流感预警机制的最高级，第六级。
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