七鳃鳗隶属于圆口纲，是一类因营半寄生生活而引发机体显著特化的动物。
A commensal organism, especially an insect that lives in the nest or burrow of another species.
为改善印刷电路板线路的电磁干扰性能，提出了一种半桥准谐振变换器印刷电路板寄生参数的提取及优化的方法；
The paper presents a method to obtain and optimize the parasite parameters of the PCB in HB QRC converter for better EMC performance.
半 寄生 的根系有可能吸取土壤的无机氮。
There is the potential of uptake of soil, inorganic nitrogen by the roots of the semi-parasite.
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