The feeling of being lonely and asking who controls the ups and downs of the vast earth means: Facing the vast and vast universe, overlooking the intricate earth, one cannot help but ask: What force controls the rise and fall of all things, the boundless Who controls the universe?

1. The background of this sentence is part of "Qinyuanchun·Changsha" written by Mao Zedong in 1925. At that time, China was in an era of great social change, with internal and external troubles and people's livelihood in dire straits. The young Mao Zedong felt that he shouldered a great historical mission and needed to raise his arms to guide the future of the country and the people.

2. The "sad and melancholy" in this sentence expresses the author's concern and emotion about the future of the country, while the "vast land" symbolizes the complexity and vastness of China's social conditions at that time. "Who "Master ups and downs" expresses the author's desire and determination to change the current social situation and control the future.

3. The profound artistic conception expressed in this sentence not only reflects Mao Zedong’s personal emotions and ideological depth, but also reflects the Chinese people’s desire and pursuit of national rejuvenation of that era. It has inspired generations of Chinese people and has become one of the famous classic quotes in modern Chinese history.

The relevant knowledge of Qinyuanchun·Changsha is as follows:

1. First of all, from the perspective of the word brand, "Qinyuanchun" is the name of the word card, and Changsha is the title of the word. The word plate is the format name of the word, indicating the syllables and rhyme of a word, while the word title indicates the content of the word. Secondly, from the content point of view, the first part of this poem depicts the autumn scenery of Changsha, while the second part expresses the author's emotion about the fate of the country and his yearning for the future.

2. Through the description of autumn in Changsha, the author shows the magnificence and vastness of nature, and at the same time expresses his concern and worry about the suffering of the people and social injustice. In terms of writing techniques, this poem uses a variety of rhetorical techniques, such as metaphor, personification, parallelism, etc. For example, "The mountains are red and the forests are dyed" uses metaphor to vividly depict the autumn scenery.

3. In terms of cultural background, "Qinyuanchun·Changsha" is a poem written by Mao Zedong when he was in Changsha, which reflects the current situation of Chinese society and the background of the times. At that time, China was in an era of great social change, with internal and external troubles and people's livelihood in dire straits. Mao Zedong expressed his worries about the fate of the country and his longing for the future through this poem.