The removal of some evil or abuse.

改造；改革。

An instance of this.

改革之事例。

To change into another and better form.

改良；革新。

To make better by the removal of faults or abuses.

改革；改善(弊病等)。

To correct or put an end to, as abuses.

改正；矫正(弊病等)。

Prisons should try to reform wrong-doers.

监牢应该设法使犯人改过自新。

To give up evil for that which is good.

去恶从善。