the protagonist of J. D. Salinger's novel 'The Catcher in the Rye'塞林格的小说《麦田里的守望者》的主人公

the main protagonists of their countries' integration into the world market积极呼吁他们的国家融入世界市场的主要倡导者

The chief protagonists in the row are Visa and Mastercard, the world's leading credit-card brands.这场纠纷的主角是世界两大信用卡品牌——维萨和万事达。