Please help I'm s0 confused

What is the “narrow cell” in line 15 of “elegy written in a country churchyard”

Why does rosaline represent a foil to juliet ?

While looking at ads on a professional job site, justin saw this job posting: "the employee should have a degree in human behavior and at least 5 years experience in behavioral modifications. we are also looking for an employee who is good at crisis divergence. typically employees will spend a lot of time supporting others."