1. Her behavior is extremely childish.
    她的行为极为愚蠢。

2. Her behavior is extremely childish.
    她的行为极为愚蠢。

3. Such a loss of dignity and descent into childish behaviour on the part of the adults deeply shocks the adolescents, and makes them resolve that in future they will not talk to their parents about the places or people they visit.
    家长这种有失身份和孩子气的作法使青春期的孩子大为震惊，决心以后不再向父母讲述去过的地方和见过的人。