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310. trivial a. 琐碎的 311. tumble v. 跌到，翻滚 312. turbulent a. 混乱的 313. unanimous a. 一致的 314. underestimate v. 低估 315. undermine v. 暗中破坏 316. undergo v. 经历 ~ great changes 317. underlying a. 潜在的 318. uphold v. 支持 ~ world peace 319. vent n.. 排放口 give ~ to 320. verge n. 边缘 =brink on the verge ofbankruptcy | 
