1. The plane began its descent into Paris.
    飞机到巴黎开始降落.

2. 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。

3. It can take as long as eight days to rig up rope ladders and to establish supply bases before a descent can be made into a very deep cave.
    有时需要花费整整8天时间来搭起绳梯，建立供应基地，然后才能到一个很深的洞穴里。

4. If no accidents occur on the way, like punctured tyres, diversions of traffic, sudden descent of fog, they will be on time.
    要是路上没有发生如爆胎、改道、突然起雾等意外事故，他们决不会迟到。