He was not much acquainted with valves of any sort, but he knew that valvae were folding-doors, and through this crevice came a sudden light startling him with his first vivid notion of finely adjusted mechanism in the human frame.

对任何类型的阀门都不是很了，知道阀门是折门，从这个缝隙射出一道光，第一次生动地想到人体结构的精密调整机制让大吃一惊。