401. nuclear a. 核子的,核能的
402. nucleus n. 核
403. retail n. /v. /ad. 零售
404. retain vt. 保留,保持
405. restrict vt. 限制,约束
406. sponsor n. 发起者,主办者 vt. 发起,主办,资助
407. spur n. /vt. 刺激,激励
408. triumph n. 胜利,成功
409. tuition n. 学费
410. twist vt. 使缠绕;转动;扭歪
411. undergraduate n. 大学肄业生
412. universal a. 普遍的,通用的;宇宙的
413. universe n. 宇宙
414. via prep. 经由,经过,通过
415. vibrate v. 振动,摇摆
416. virus n. 病毒
417. voluntary a. 自愿的
418. volunteer n. 志愿者 v. 自愿
419. vote v. 选举 n. 选票
420. wagon n. 四轮马车,铁路货车
421. appoint vt. 任命,委派
422. approach v. 靠近,接近 n. 途径,方式
423. appropriate a. 适当的
424. bunch n. 群,伙;束,串
425. bundle n. 捆,包,束 vt. 收集,归拢
426. ceremony n. 典礼,仪式
427. chaos n. 混乱,紊乱
428. discount n. 折扣
429. display n. /vt. 陈列,展览
430. equivalent a. 相等的 a. 相等物
431. erect a. 竖直的 v. 建造,竖立
432. fax n. /vt. 传真
433. fertile a. 肥沃的;多产的
434. fertilizer n. 肥料
435. grateful a. 感激的
436. gratitude n. 感激
437. horror n. 恐怖
438. horrible a. 可怕的
439. Internet n. 国际互联网,因特网
440. interpret v. 翻译,解释
441. interpretation n. 解释,说明
442. jungle n. 丛林,密林
443. knot n. 结 vt. 把...打成结
444. leak v. 漏,渗出
445. lean vi. 倾斜,倚,靠
446. leap vi. 跳跃
447. modify vt. 修改
448. nylon n. 尼龙
449. onion n. 洋葱
450. powder n. 粉末
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