The phrase 'be preserved' can be substituted with a number of synonyms depending on the context. It can be replaced with 'be conserved', 'be protected', 'be safeguarded', 'be maintained', 'be sustained', or 'be defended'. The commonality between these words is that they all signify the act of keeping something in its original state or protecting it from damage or decay. For example, a historical artifact should be preserved for future generations to appreciate, and a forest reserve should be conserved to protect wildlife. The choice of synonym will depend on the emphasis and intention of the sentence, but they all have the same fundamental meaning of retaining or protecting the integrity of something.