First of all, we need to make clear the theme and content of this poem. Frontier fortress is a poem describing the scenery of ancient frontier fortress, expressing the poet's concern for the security of the national frontier and praising the soldiers' unremitting efforts to defend the motherland.
Next, we need to determine the hierarchy of mind maps. As a poem, we can regard the theme, paragraphs, sentences and keywords in the poem as four levels of mind map.
First, we take "filling" as the central theme of the mind map, and then break it down into several main paragraphs. For example, we can divide poetry into three sections: frontier fortress scenery, warrior image, thoughts and feelings.
Next, under each paragraph, we can list the main sentences and keywords. For the paragraph "Frontier Scenery", we can draw some key words to describe the frontier scenery, such as "Desert", "Great Wall" and "Ren Hu".
For the paragraph "image of a warrior", we can draw some key words to describe the image of a warrior, such as "perseverance", "courage" and "loyalty". For the passage of "thoughts and feelings", we can draw some key words to express the poet's feelings, such as "worry", "admiration" and "praise".
Finally, we connect these keywords and sentences with lines according to the hierarchical structure to form a complete mind map. On the connecting line, we can use different colors or thicknesses to distinguish different levels or categories.
In addition, in order to make the mind map clearer and easier to understand, we can add some notes or explanations next to each keyword or sentence. For example, for the keyword "desert", we can add the annotation "desolate and vast desert area" to better understand the poet's intention and artistic conception of poetry.
In a word, drawing mind map requires us to deeply understand the theme and content of poetry, determine the appropriate hierarchical structure, and use keywords and sentences to express the main content. Finally, use different colors or thicknesses to distinguish different levels or categories, and add some notes or explanations next to each keyword or sentence to better understand and remember the structure and meaning of poetry.