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biology 生物 used to describe a relationship between two different living creatures that live close together and depend on each other in particular ways, each getting particular benefits from the other 共生（关系） Humans have a symbiotic relationship with trees. 人类与树木有共生关系。
used to describe a relationship between people, companies, etc. that is to the advantage of both 合作关系；互惠互利的关系 The two formed a close friendship and a symbiotic working relationship that lasted half a century. 两人建立了密切的友谊，并建立了半个世纪的共生工作关系。