Bing Xin's four poems (mother, paper boat, successful flower, green bud) express the author's inner feelings from which angle?

Bing Xin's four poems are selected from the collection of poems "Stars in Spring Water", imitating Tagore's "Birds" to express his feelings and memories. They are short and pithy, and don't pursue rhythm. Casual writing has a simple philosophy.

The first "mother" is to seek the protection of childhood maternal love, show the greatness and selflessness of maternal love, and pay attention to the contribution of maternal love.

The second "paper boat" is the nostalgia, attachment, gratitude and return to maternal love in youth. Focus on gratitude and report maternal love.

The third "Successful Flowers" is a metaphor for people who have flowers. It is hard to write success: it is the crystallization of tears and blood, and it is the bud bred by struggle and sacrifice.

The fourth "Green Bud" praises beautiful youth and positive life, and encourages young people to serve the motherland faithfully.