According to pediatrician Park Jin-Kyun. Park believes that there are two types of children: those who are difficult and those who are docile. Difficult children lack concentration and get easily distrachted. They also sensitive. timid. stubborn, and unruly. On the other hand, docile children are obedient, not as sensitive, and socialize well with others. 선생님 마지막줄 as는 as~as 원급에 뒤 as를 생략한 as인가요?