regulieren in English:

Traffic lights are used to regulate traffic.

Forests regulate the water cycle and take away harmful carbon dioxide.

Perspiring helps to regulate body temperature.

Parents should regulate how much TV their children watch.

They regulated social, political and economic life in these areas. In some areas use of these terms may be regulated by law.

There is a written and an unwritten law. The one by which we regulate our constitutions in our cities is the written law; that which arises from customs is the unwritten law.