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489. scope n. 范围
490. seemingly ad. 表面上
491. speculate v. 猜测
492. steep a. 陡的
493. summon v. 唤起 How can I ~ up his courage?
494. shift v. 移动;转变 ~ responsibility on to others
495. transient a. 短暂的
496. prompt a. 迅速的
497. impart v. 传授
498. embody v. 体现
499. confront v. 面对
500. triumph n. 胜利
