What kind of thoughts and feelings does this poem express?

He expressed Ai Qing's love for the motherland and his concern about the uncertainty of the future fate of the motherland.

The background of this poem is the tragic scene of China society under the Japanese occupation at that time, which made Ai Qing feel extremely sad at this moment, so he wrote this poem with great sadness.

In addition, this poem is also excellent in expressing emotions. The author uses the image of "bird" to make the whole poem very emotional. Patriotism is an emotion, which stems from the love and awe for the motherland, and also includes the respect and admiration for the historical and cultural traditions of the motherland. In this case, the author expresses his unswerving love for the motherland by describing his suffering in the life of the motherland. Although there are many difficulties and hardships in life, the author still insists on staying in this land, showing his deep loyalty to the motherland. This patriotism is great, because it represents the deepest love and commitment to the motherland.