stronghold

n.堡垒，要塞

stripling, stripped, stripper, stripy, strive, strive for, strobe light (also strobe), stroboscope, stroboscopic, strode, stroke, stroll, stroller, strolling, strong, strong language, strong-arm, strong-box, strong-minded, strong-room, strongly, strontium, strontium 90, strop, stroppy, strove, struck, structural, structuralism, structuralist, structurally, structure, strudel, struggle, struggle against, struggle for, struggle to one's feet, strum, strumpet, strung,