Parasitic worms seemed to be a stronger driver of natural selection than viruses or bacteria.

寄生虫在自然选择中的作用比细菌或病毒更为重要。

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Abstract :Parasitic relationship exists between bacteria and phages, on one hand, bacteria resist the infection from phages, on another hand, phages develop the abilities against host bacteria.

摘要 ：细菌与噬菌体间是一种寄生关系，一方面细菌抵抗噬菌体感染，另一方面噬菌体也产生抗宿主菌防御的改变。

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At present, symbiotic or parasitic bacteria were reported to be associated with many plant pathogenic nematodes, but the relationship between PWN and its associated bacteria was not understood.

目前，许多植物病原线虫都报道有伴生细菌，它们之间属于共生或者寄生关系，而松材线虫与其伴生细菌的关系还有待研究。

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