act的词源是do, 干着或干了的事情也可以叫act。抄全字典的话，抄的和看的都麻烦，在阅读中体会吧。

act和action有啥区别？action: doing sth; act: n. action, v. do. 越长的单词意思越专一，比如activity: busy, energetic, or占据时间多的action. 放着merger不用而用amalgamation，ma-la-ge-ba-zi.

As a interjection action is demanding or signifying the start of something, usually an act or scene of a theatric performance. Overprotected Britney Spears (Action!) Say hello to the girl that I am!

Acting can be used before the title of a job to indicate that someone is doing that job temporarily. [牛津] Our deputy manager is the virtual head of the business. 我们的副经理是公司的实际负责人。IT业把virtual function翻译成虚函数，virtual reality虚拟现实。敢不敢跑到deputy manager面前说“你是个虚负责人”？

english-for-students稻糠亩:
1. It is an act of kindness to help a blind man cross the street. [things done, deed]
2. This is a play in four acts. [四幕]
3. There was a song and dance act in the program. [表演. number也有类似的意思，FRIENDS里出现过]
4. Do not take her seriously. It is all an act. She is just putting on an act.
5. Parliament has passed an act which makes such thing illegal.
a. Leonard is a man of action, he proposed many times.
b. The action of the play is set in a small town near LA.
c. Thousands of people were killed in action during the war.
d. Sheldon brought an action against Howard's neighbor. [lawsuit]
e. Amy studies the action of the brain.

Acting is an activity in which a story is told by means of its enactment by an actor or actress who adopts a character - in theatre, television, film, radio, or any other medium that makes use of the mimetic mode. Acting involves a broad range of skills, including a well-developed imagination, emotional facility, physical expressivity, vocal projection, clarity of speech, and the ability to interpret drama. Acting also demands an ability to employ dialects, accents, improvisation, observation and emulation, mime, and stage combat. Many actors train at length in specialist programs or colleges to develop these skills. The vast majority of professional actors have undergone extensive training. Actors and actresses will often have many instructors and teachers for a full range of training involving singing, scene-work, audition techniques, and acting for camera.

Acts of parliament, sometimes referred to as primary legislation, are texts of law passed by the legislative body of a jurisdiction (often a parliament or council). In most countries, acts of parliament begin as a bill, which the legislature votes on. Depending on the structure of government, this text may then by subject to assent or approval from the executive branch. A draft Act of Parliament is known as a bill. In other words, a bill is a proposed law that needs to be discussed in the parliament before it can become a law.

An Act of Congress is a statute enacted by Congress. Acts can affect only individual entities (called private laws), or the general public (public laws). For a bill to become an act, the text must pass through both houses with a majority, then be either signed into law by the president of the United States or receive congressional override against a presidential veto.

An Act of Tynwald is a statute passed by Tynwald, the parliament of the Isle of Man. The Isle of Man is a Crown Dependency, which means that it’s technically a possession of the crown (aka the Queen) directly, not of the UK.

[柯林斯+LDOCE]
1. catch sb in the act (of doing sth): 抓个现行
2. clean up sb's act: start behaving sensibly and responsibly
3. act out不是演出的意思：
a) If you act out an event which has happened, you copy the actions which took place and make them into a play. Ross used to come home and act out the movie for Ben.
b) Some teenagers act out their distress by running away. [express feeling through action]
4. If a child act up, he or she behave badly. 有首歌的名字叫堆积情感(Pent-up feelings) Is screaming at the top of your voice a good way of venting pent-up frustration?
5. If a machine or part of your body acts up, it does not work properly. Penny's car is acting up again.

六级/考研单词: hectic, merge, signify, spear, deputy, parliament, illicit, enact, actress, medium, physics, vocal, clarify, interpret, dialect, accent, emulate, combat, undergo, seldom, instruct, legislate, jurisdiction, congress, statute, affection, entity, unite, override, veto, isle, teenager, distress, scream, vent, frustrate, penny