across[E5krRs]  prep.1.穿过，到…的另一边：We walked across the park. 我们走过公园。/ There is a bridge across the river. 河的两边有桥相连。2.在…的另一边：The bus stop is just across the street. 公共汽车站就在街道的那边。/ He shouted to me from across the room. 他在房间的另一边喊我。3.表示“交叉”：He sat there with his arms across his chest. 他坐在那儿，两臂交叉放在胸前。adv. 1.穿过，跨过，从一边到另一边：Can you swim across? 你能游到对岸去吗？2.交叉：He sat there with his arms across. 他交叉着手臂坐在那儿。

【辨析】across 与 through：都可表示“横过”或“穿过”，前者主要表示从某物的表面“横过”，涉及“面”的概念；而后者则指在里面或在一定空间范围内“穿过”，涉及“体”的概念。

act[Akt] n.1.[C]行为，行动，举动：It’s a foolish act. 那是愚蠢之举。/ He did another noble act. 他又做了一件高尚的事。2.[C]法令，条例：Social Security Act社会保险条例 / under this Act 根据本条例3.[C](戏剧的)一幕：a play of two acts 两幕剧  v. 1.行动，做事，举止：Think before acting. 三思而后行。/ It's time to act. 该采取行动了。/ You should not act in haste. 不可操之过急。2.表演：He acts well. 他戏演得不错。3.担任，充当：A trained dog can act as a guide to a blind person. 经过训练的狗可作盲人的向导。4.起作用，生效：The medicine acts on the heart. 这药对心脏起作用。5.扮演：He acted (the part of) Hamlet very well. 他扮演哈姆雷特(这个角色)很出色。◆act of God 自然灾害 / be a hard [tough] act to follow 做某事出色使别人难以企及 / get in on the act (为得到好处而)参加(某活动) / get your act together 协调一致 / in the act of doing sth 正在做某事的时候，当场 / act sth out 模拟再现某事 / act up (孩子)调皮捣蛋；(身体或设备)出毛病

tion[5AkF(E)n] n.1. [U]行动；动作：We have to express our thought by action. 我们要用行动表达我们的思想。2.[C]行为；举动：I regret my bad actions. 我懊悔我不良的行为。◆caurse of action 采取的行动 / in action 行动中，正在工作或做某事 / into action 开始工作，开始运行 / out of action 出故障的，无法正常工作的 / take action 采取行动

active[5AktIv] adj.1. 活动的；活跃的：I soon became active in London. 我不久就在伦敦活跃起来了。2.主动的；积极的：He urged all concerned to take an active part in the movement. 他敦促一切有关人士积极参与这个运动。

activity[Ak5tIvItI] n.1.[C,U]活动：My favourite activity is reading. 我最喜欢的活动是阅读。2. [U]活力；活动性：The house has been full of activity all day. 房子里整天都很热闹。

actor[5AktE(r)] n. [C]演员；男演员：a film actor 电影演员

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