Spring in March, ordinary people.
In order to welcome the new year, I will not leave the old curtains.
The wings were wet with light rain, and the smell of mud bloomed.
The nest grew into a chick and stayed with it for many years.
The "old curtain" in this couplet has the following three beauties:
1. "Old Curtain" indicates that this is an ordinary family, which echoes the "ordinary family" in the first couplet. 2. The "old curtain" is a sign that Swallow has successfully found the family that lived in the previous year.
3. "Old Curtain" and "New Swallow" in the previous sentence are nouns and parts of speech are relative, which meet the antithesis requirements of poetry. For reference.