prolongation

n 1 [U] prolonging or being prolonged 延长; 延伸. 2 [C] addition or extension that prolongs sth 增加或延长的部分.

Project Anehin, projectile, projection, projection room, projectionist, projector, prolapse, prole, proletarian, proletariat, proletariat `pr4ule'te4ri4t], proliferate, proliferation, prolific, prolifically, prolix, prolixity, prologue, prologue (US also prolog), prolong, prolonged, prom, promenade, promenade concert, promenade deck, prominence, prominent, prominently, promiscuity, promiscuous, promiscuously, promise, promise oneself, promise to do, promising, promisingly, promissory, promissory note, promontary, promontory,