同学你好，该知识点来自沪江网校《新概念英语1、2、3、4册连读【学霸班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好~
Such a loss of dignity and descent into childish behaviour on the part of the adults成年人的这种丧失尊严和孩子气的行为
descent (形势的)恶化;(人的)堕落，沦落
descent into childish behaviour堕落入孩子气的行为，有失身份
on the part of  就……而言，on the part of the adults就成年人而言

however不管……
however good and adequate 不管多好，多能胜任
they may be both as parents and as individuals 他们作为家长和个人能够……

不管作为家长和个人，他们能有多好，多能胜任

祝同学学习进步~