426. shield v. 保护
427. simultaneously a. 同时地
428. sole a. 唯一的
429. sponsor n. 赞助者
430. startle v. 惊吓
431. stray v. 走失
432. substantial a. 可观的,大量的=considerable> a substantial income
433. sufficient a. 充分的
434. supplement v./n. 补充>He ~ed his income by taking a part-time job.
435. testify v. 作证
436. trigger v. 引发 ~ a debate/war
437. swing v. 摇摆
438. universal a. 普遍的
439. utilize v. 利用
440. variation n. 变动> the ~ in temperature
441. virtually ad. 实际上
442. wretched a. 难过的
443. flexible a. 灵活的 The dancer’s body is very ~.
444. facet n. 侧面 a ~
445. endeavor v. /n. 努力