First, refer to different
1, improve: improve.
2. promotion: promotion.
3. development: development.
Second, the usage is different.
1, improve: used as transitive improve:improve can take nouns or pronouns as objects, but it is not used in passive structures. When used as an intransitive verb, the active form usually contains passive meaning.
2.promote: it can be used at all stages of the development of things. Used as a transitive verb, followed by a noun or pronoun, or a clause guided by an interrogative word.
3.develop:develop can be used as a transitive verb or an intransitive verb. When used as a transitive verb, it is followed by a noun or pronoun as an object. Can be used for passive structures.
Third, the emphasis is different.
1, improve: focus on the original bad, for the better.
2, promotion: focus on the original good, and then continue to get better.
3. Development: Focus on comprehensive development.