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