An example of a prepositional phrase is, “With a reusable tote in hand, Matthew walked to the farmer's market.” Every prepositional phrase is a series of words consisting of a preposition and its object. In the example above, “with” is the preposition and “reusable tote” is the object.
Unique means to be unlike anything else. When something or someone unique, they are one of a kind. It is often a very nice compliment when meant as a compliment. Sometimes unique can be used as a placeholder for a compliment when someone does not wish to insult the other person. If you think something is ugly or bad, you can say unique, because the thing or person can still be unlike anything else, even if it's not good.