Answer:
I think the meaning of the example is saying normally you would add "like or as" to the sentence "Love is a ruby red rose." and it could sound like with the world like " Love is like Ruby red rose."
Explanation:
A metaphor: "Unlike a simile, where two things are compared directly using like or as, a metaphor's comparison is more indirect, usually made by stating something is something else."
Hopefully this helps you!