291. unbind 解开 unbound unbound
292. unbuild 拆除 unbuilt unbuilt
293. underbid 出低价 underbid underbidden, underbid
294. underbuy 贱价买走 underbought underbought
295. undercut 廉价出售 undercut undercut
296. underdo 不尽力 underdid underdone
297. underfeed 喂不饱 underfed underfed
298. undergo 遭受 underwent undergone
299. underlay 铺垫 underlaid underlaid
300. underlet 低价出租 underlet underlet
301. underlie 位居其次 underlay underlain
302. underpay 克扣 underpaid underpaid
303. underrun 跑不过 underran underrun
304. undersell 抛售 undersold undersold
305. underset 暗流 underset underset
306. undershoot 进入射程 undershot undershot
307. understand 理解 understood understood
308. undertake 担任 undertook undertaken
309. underwrite 签名 underwrote underwritten
310. undo 取消 undid undone
311. undraw 拉开 undrew undrawn
312. unfreeze 解冻 unfroze unfrozen
313. ungird 解带 ungirded, ungirt ungirded, ungirt
314. unhang 解除悬挂 unhung unhung
315. unknit 拆开 unknitted, unknit unknitted, unknit
316. unlade 卸载 unladed unladed, unladen
317. unlay 松开 unlaid unlaid
318. unlearn 忘却 unlearnt, unlearned unlearnt, unlearned
319. unmake 恢复原状 unmade unmade
320. unreeve 抽出 unrove, unreeved unrove, unreeved
321. unsay 撤销 unsaid unsaid
322. unset 去除设定 unset unset
323. unsling 取去悬索 unslung unslung
324. unspeak 缄默 unspoke unspoken
325. unstick 扯开 unstuck unstuck
326. unstring 去掉绑扎 unstrung unstrung
327. unswear 毁弃誓言 unswore unsworn
328. unteach 使人忘却 untaught untaught
329. unthink 打消念头 unthought unthought
330. untread 折回 untrod untrodden, untrod
331. unweave 拆解 unwove unwoven
332. unwind 打开 unwound unwound
333. upbuild 在上面建 upbuilt upbuilt
334. upcast 上抛 upcast upcast
335. uphold 赞成 upheld upheld
336. uppercut 上击 uppercut uppercut
337. uprise 起义 uprose uprisen
338. upset 颠覆 upset upset
339. upsweep 向上弯曲 upswept upswept
340. upswing 跃进 upswung upswung
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