扁平身体的寄生或非寄生的蠕虫。
它们的数量大大超出了非寄生性或自由生存的生命形式，基本上没有什么生命可以完全摆脱寄生虫的影响。
You can find them everywhere on our planet, they easily outnumber non-parasitic or "free living" lifeforms and almost nothing lives entirely free from their influence.
植物寄生线虫的数量大于非寄生线虫。
The Numbers of plant parasitic nematodes were more than non-parasitic nematodes in all treatments.
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