protract

v. 延长，拖长

protective, protective custody, protectively, protector, protectorate, protege (fem 阴性作 protegee), protein, protein-rich, protest, Protestant, Protestantism, protestation, protester, protestingly, protocol, proton, protoplasm, prototype, protozoan, protozoon (also protozoan), protracted, protraction, protractor, protrude, protrusion, protrusive, protuberance, protuberant, proud, proudly, Prov, provable, provably, prove, proven, provenance, provender, proverb, proverbial, proverbially,