三一律（一个情节、一个地点、一个时间）
The classical unities,Aristotelian unities or three unities are rules for drama derived from a passage in Aristotle's Poetics.In their neoclassicalform they are as follows:
The unity of action:a play should have one main action that it follows,with no or few subplots.
The unity of place:a play should cover a single physical space and should not attempt to compress geography,nor should the stage represent more than one place.
The unity of time:the action in a play should take place over no more than 24 hours.
Character不是三一中的一个