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For some viral strains, they were four times more likely to visit an infected plant than a healthy one.
有一些受感染的病株甚至能吸引比健康植株多三倍的蜜蜂。
But they rely on weakened viral strains that must be cultivated in non-human tissue over long periods of time.
但它们依赖于必须在非人体组织中长期培养的弱化病毒株。
In biology, a strain is a low-level taxonomic rank used in three related ways, usually at the infraspecific level (within a species).
依恋情感网英汉例句词典收录3870147条英语例句词条，基本涵盖了全部常用英语单词的释义及例句，是英语学习的有利工具。