中文翻译与英英解释

【生物学】兼性寄生物，兼性寄生菌。

facultative:    adj. 1.特许的，特准的。 2.任意的，随意的。 3 ...

parasite:    n. 1.寄生物；寄生虫；寄生菌；寄生植物；寄生矿物。 ...

A facultative parasite is an organism that may resort to parasitic activity, but does not absolutely rely on any host for completion of its life cycle.