To understand the spirit of Populus euphratica expressed in this poem, we must understand the living environment of Populus euphratica. Populus euphratica has peculiar leaves. Because it grows in extremely arid desert areas, in order to adapt to the arid environment, the leaves growing on the young branches of young trees are as long and narrow as willows, while the leaves on the old branches of large trees are as round as poplars. After understanding this, you will know that this poem is praising the unyielding life of Populus euphratica and the spirit of daring to fight against nature.