2. In Cen Can's frontier poems, he is always full of great ambition of serving the country generously and optimistic spirit of taking risks. For example, in the "Song of Farewell to the Western Expedition", the poet used exaggerated rhetoric to describe the dangerous environment, such as "On the night of September, the wind was cold on the wheel tower, and the valley was full of pebbles like pecking buckets, which flowed down with the wind", trying to render the harsh environment on the border, and then describing the heroic and invincible soldier image, showing the strict military scene and expressing