儿童的英文复数怎么写?

　　他善于和儿童打交道的本事使他得到了这份工作。

　　His aptitude for dealing with children got him the job.

　　被绑架的儿童在交付了赎金后均安然回到家中。

　　The kidnapped children were all ransomed and returned home unharmed.

　　一些儿童进入少年期会完全变成另一个人。

　　Some children undergo a complete transformation when they become teenagers.

　　五岁儿童牙齿不健康的比例高。

　　A high proportion of five-year-olds have teeth in poor condition.

　　人们对儿童保育问题议论纷纷。

　　There had been much debate on the issue of childcare.