There are a few ways of preventing bitter pit from affecting apple and plant trees.

The crucible helps to prevent the heat from affecting the solution.

This will prevent the experiments from affecting you until we're more sure of ourselves.

The idea is to 'trap' all the magnetic lines of force within the metal and thus preventing it from affecting other objects in the area.

Put the lid back on the bottle immediately to prevent moisture from affecting the other strips.

This system acts to prevent alien substances from affecting the body in a harmful way.

And of course it did not prevent gravity from affecting the circulatory system.

No treatment can prevent alcohol from affecting your fetus.

This prevents a boundary layer from forming on the floor of the working section and affecting the results.

This prevents a bug within a process from affecting other processes, or the operating system itself.