Meanwhile, the deadliest strains of the virus perished with their hosts as natural selection favored strains that could infect hosts but not kill them. Thus, natural selection stabilized this host-parasite relationship. — 同时,由于自然选择更倾向于那些能够感染寄主但不致其死亡的品系,这种病毒中最致命的品系也随寄主灭亡了。因此,自然选择使得寄主和寄生物的关系趋于稳定。 ① strain /streɪn/ n. (动、植物的)系,品系;压力;拉伤 vt. 拉伤;过度使用 ② parasite /ˈpærəsaɪt/ n. 寄生物;寄生虫

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