One way to picture symbiosis: two things that are not the same kind end up sharing one life. A fungus and an alga grow into a single crust on a rock and nobody can say where one stops. A bee and a flower meet again every summer, and each has become part of how the other keeps going. Take one side away and the other changes. The word travels from that picture to shops that feed each other customers, and to a street where tin roofs and glass towers stand side by side.
From the word’s history
The supplied source records the word as coming from Ancient Greek sumbíōsis, living together, and analyses it on the surface as sym- plus -biosis. That is the picture itself: the two parts of the word already say together and life.
來源資料記的是：這個字來自古希臘文 συμβίωσις（sumbíōsis），意思就是「一起生活」，拆開看是 sym-（一起）＋ -biosis（生活）。所以上面那幅畫面其實就寫在字裡面——「一起」和「生活」這兩塊，本來就是它的組成。
Wiktionary, "symbiosis"
登入就可以看每一支怎麼連回核心畫面。