* Simple and straightforward: "The local bakery has been a mainstay of the neighborhood for over 50 years."
* Emphasizing importance: "Our community theater is the mainstay of the arts scene in this small town."
* Describing a reliable source: "Rice is a mainstay of the Asian diet."
* Focusing on stability: "Despite the economic downturn, the company's strong customer service remained its mainstay."
* With a figurative meaning: "The old oak tree was a mainstay of the park, offering shade and beauty for generations."