Sufficient pathogen, susceptible host and favourable environmental conditions, which are necessary to the outbreaking of the plant disease.

一定数量的病原生物、易感病的寄主以及有利的发病条件是任何病原生物引起的植物病害发生的必要条件。

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But what we don't know is why they become susceptible to this host of pathogens, viruses and fungus.

但是我们没有弄明白的是为什么蜜蜂们会对这些病原菌，病毒和真菌这么敏感。

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Well there's a whole host of reasons why people are susceptible to this impact bias.

很多因素会导致人们人们易受预期偏见的影响。

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Professor David Warhurst, of the Public Health Laboratory Service malaria reference laboratory, said it was true that fast-dividing cells were more susceptible to a host of chemical agents.

BBC: Garlic 'fights malaria'

As it is, between 1999 and 2003 (that is, including during the recession) jobs were created, not lost, in a whole host of white-collar occupations said to be particularly susceptible to outsourcing.

ECONOMIST: The great hollowing-out myth | The