Thus, natural selection stabilized this host-parasite relationship.
因此，自然选择让这种寄主-寄生关系变得稳定。
Parasitism is a kind of predator-prey relationship in which one organism, the parasite, derives its food at the expense of its symbiotic associate, the host.
寄生是一种捕食者与被捕食者之间的关系，寄生者利用共生伙伴——宿主来获取食物。
Thanks to this parasite-host relationship, cancer can grow however it wants, wherever it wants.
正是基于这种寄生——宿主的这种关系，癌细胞才可以肆意生长。
As a main kind of digestive enzyme of parasite, cysteine protease plays an important role in the relationship between parasite and host.
作为寄生虫的主要消化酶之一，半胱氨酸蛋白酶在寄生虫与宿主的相互关系上具有重要的作用。
As a main kind of digestive enzyme of parasite, cysteine protease plays an important role in the relationship between parasite and host.
作为寄生虫的主要消化酶之一，半胱氨酸蛋白酶在寄生虫与宿主的相互关系上具有重要的作用。
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