act
(a)perform a part in a play or film; be an actor or actress （在戏剧或电影中）演出; 当演员
例如：Have you ever acted? 你当过演员吗? * She acts well. 她演得很好.
(b)take the part of (a character in a play or film) 扮演（戏剧或电影中的角色）
例如：Who is acting (the part of) Hamlet? 谁扮演哈姆雷特（这个角色）?