For instance, we commonly refer to birds "learning" to fly.
For instance, we commonly refer to birds "learning" to fly, because they cannot fly at first, but can a week or two later.
For instance, we commonly refer to birds "learning" to fly, because they cannot fly at first, but can a week or two later.
간단한 문구로 변경: For instance, we commonly refer to birds "learning" to fly. 산출: