1、The lichen is a symbiont formed by the mutualistic relationship between fungi and algae.
地衣是由真菌和藻类之间的互利共生关系形成的共生体。
2、The ants and the aphids have a symbiotic relationship, where the ants protect the aphids and in return, the aphids provide them with a source of food.
蚂蚁和蚜虫之间存在一种互利共生的关系，蚂蚁保护蚜虫，蚜虫则为它们提供食物来源。