Daily cleaning is required to prevent the risk of tear-staining.

Americans have been led to believe that prohibition is required to prevent drugs from destroying our society.

States are also required to prevent the abduction, sale, or trafficking of children.

This radiation is required in order to prevent violation of the second law.

Hence, a close match is required to prevent any complications.

Care will be required to prevent pollution of the burn.

Urgent steps are required to prevent anything like it again.

Action is required now to prevent social systems from losing public credibility.

With other types of pans, some oil or fat is required to prevent hot food from sticking to the pan's surface.

According to aid workers in the region, more food is required immediately to prevent mass starvation.