n. 动作；行动（action的复数）

n something done (usually as opposed to something said)

n the state of being active

n a military engagement

n a process existing in or produced by nature (rather than by the intent of human beings)

n the series of events that form a plot

n the trait of being active and energetic and forceful

n the operating part that transmits power to a mechanism

n a judicial proceeding brought by one party against another; one party prosecutes another for a wrong done or for protection of a right or for prevention of a wrong

n an act by a government body or supranational organization

n the most important or interesting work or activity in a specific area or field

v institute legal proceedings against; file a suit against

v put in effect