1. Grasp the sentences describing swallows and spring, understand the content of the text and feel the lively, lovely and dazzling spring of swallows.
2. Understand the author's careful observation and concrete and vivid description of things.
3. Feel the loveliness of swallows and the author's thoughts and feelings of loving spring and nature.
In the author's eyes, swallows are the cutest, so he describes swallows from three aspects: appearance, flight time and flight fatigue, and praises spring.