The word you're looking for is temporary. It's a nine-letter word that is related to the words 'short time'.
The answer is : Oh, she does teach the torches to burn bright!
Metaphor is a form of literature technique that contain an implied comparison between a certain meaning with another.
By saying she doth teach the torches to burn bright!, Rome basically saying that Juliet is a source of light, like a star, against the darkness his life.
For an allusion to accomplish its purpose it must refer to a widely known story or piece of art.
Just did the test I this hope it helps someone in the future!
