a butterfly with mealy wings的用法和样例：
- A butterfly must not be confused with a moth.
- Under the cover of darkness, a butterfly with folded wings rests gracefully on a leaf in the Danum Valley Conservation Area in Sabah, Borneo.
- What amused me most was a little boy who was trying to catch a butterfly with his hands.
- I think this worm is a larva of a butterfly.