315. undermine v. 暗中破壞
316. undergo v. 經歷 ~ great changes
317. underlying a. 潛在的
318. uphold v. 支持 ~ world peace
319. vent n.. 排放口 give ~ to(發(fā)泄)
320. verge n. 邊緣 =brink> on the verge of bankruptcy
321. versatile a. 多才多藝的
322. vicinity n. 附近 in the ~
323. visa n. 簽證
324. visualize v. 設想