not so ~ as

not so ~ as

개는 말 만큼 강하지 않다
A dog is not as strong as a horse (is)
A dog is not so strong as a horse (is)

위 두 문장 모두 as ~ as 의 부정문입니다
A dog is as strong as a horse

"노력에 비해 성적이 안나오다" 는
The results is not so good as his effort.
The achivement is poor for his effort.