4.Recent research shows that, compared to girls, boys are more susceptible to emotional disturbances, learning problems, violentbehavior, drug use, and lawbreaking.
5.The crusade thought in the Koran was different with the traditional custom in Arab Peninsula before the emergence of Islam, its social substance laid in emphasis on the religious meaning and regional principle of violentbehavior, and it constituted an important part of the Islamic nation theory.
