This topic is the reading comprehension of Qi Nian's poem Yan 'an I Pursue You. Part of the original text is as follows:
Flying back like a swallow, pursuing the past spring; Like a thriving young tree, it is pursuing rain and dew and the sun.
Combining this paragraph with the article, we can know that "Swallow" and "Little Tree" refer to "We"; "Spring", "rain and dew" and "sun" refer to "Yan 'an", that is, "Yan 'an spirit".
Extended data
One or two paragraphs in the poem are the pursuit of Yan 'an spirit. The first section uses two metaphors to describe this pursuit: the pursuit of Yan' an is like the swallow's pursuit of the past spring, just like the young tree's pursuit of rain and dew and the sun. Swallows are migratory birds. They fly to the north in spring and to the south in autumn. It's cold in the north, but it's warmer in spring, and everything on the earth is full of vitality.
So swallows should pursue spring scenery. Rain and sunshine are essential for the growth of young trees, so young trees should pursue rain and sunshine. What the two metaphors themselves describe here will not be said and omitted.
This is "We pursue Yan 'an". Yan 'an, in fact, refers to Yan 'an spirit, full of vigor and vitality, a vigorous spirit and an indispensable spirit for our healthy growth.