To use the past to describe the present: to use ancient people and events to describe people and events today in reality.
To use the past to satirize the present: to comment on the reality by commenting on ancient people and events.
Reminiscent of the past and sentimental about the present: an idiom meaning: recalling the past and feeling sentimental about the present. Refers to a lonely and pessimistic thought and mood.
Learn from the past to learn from the present: Looking back on the long river of history, using history as a mirror, we can know the rise and fall; every day in history is a mixed blessing; understanding today's history, learning from the past can learn from the present. The "jian" here can be understood as Criteria/standards/things that serve as warnings or lessons.
Hope to adopt