These were problems caused by a lack of parental control.这些问题是由于缺乏父母控制所造成的。

Parental attitudes to the problem of truancy vary widely.家长对孩子旷课问题的态度千差万别。

What I believe in is parental responsibility.我相信的是父母的责任。

Many inherited diseases are passed only through one parental line.很多遗传性疾病只通过一个亲本品系遗传。