A person or an animal imitates a poem for two objects.

(Example 1) Butterflies are also experts in flower picking, but they lack the preciousness of bees. Honey made by bees is the crystallization of dedicated labor; Butterflies pick flowers in order to get the essence of flowers. (Example 2) Grass is also a kind of green life, but it lacks the persistent pursuit of big trees. Trees take root in order to stand firm; Grass blooms just to attract bees and butterflies. (The answer is not unique)