2. refers to a comfortable, happy and carefree life. The road of "root" growth, the underground is dark, there is no sunshine, no breeze, no birdsong. Only darkness, cold and humidity.
3. It shows the feelings and spirit that the "roots" are willing to sacrifice themselves, devote themselves wholeheartedly and ask for nothing in return.
This poem uses a way of writing to express one's wishes. With the help of plant roots, provide water and nutrients for plants and praise a dedication. From it, I learned that every position has its necessity. If I can't bloom beautiful flowers, then I will be the root of dedication and contribute my light and heat to the people and the motherland.