Test and analysis: from the content category of the poem, it is a lyric poem. Therefore, when answering how to "express this theme", we should first start with the relationship between emotion and scenery, and consider the corresponding relationship between images, artistic conception and emotions in the whole poem. In this poem, the waning moon, the west wind, the sound of trumpets and first frost are all common images of ancient poetry that exaggerate the desolate atmosphere. Secondly, candidates should also consider whether there are other writing skills that are conducive to expressing emotions in poetry, such as the comparison of the second couplet and the questioning of the last couplet.