relevant和related的区别？

relevant (comparativemore relevant, superlativemost relevant)

1. Directlyrelated, connected, or pertinent to a topic.His mother provided some relevant background information concerning his medical condition.
2. Not out of date; current.

related (comparativemore related, superlativemost related)

1. Standing in relation or connection. [quotations ▼]Electric and magnetic forces are closely related.
2. Being a relative of.Everyone is related to their parents.
3. Narrated; told.
4. (music) Same as the adjective relative.
5. (mathematics) Fulfilling a relation.
6. (in combination) Having a relationship with the thing namedGun-related crime.