What does Wen Zhiming's plum blossom poem mean when he says that the moon moth controls the non-element?

I was furious and climbed up the railing alone. The wind and rain just stopped. I looked up at the sky. I can't help screaming at the sky, and my heart is full of patriotism. More than 30 years of fame, such as dust, eight thousand miles of life through many storms. My hero, we should seize the time to make contributions to our country, and don't waste our youth until we are old. I can't forget the great humiliation in Jingkang period. When will the resentment as a national civil servant disappear? I want to get on the chariot and step over the Helan Mountain Pass. I was full of ambition and vowed to drink the blood and eat the flesh of the enemy. When I recover the old mountains and rivers, I will report good news to the country. Climbing up the railing and looking at the Central Plains, I was so angry that my hair stood on end. It was already late in the sudden rain. Raise your head, look up at the sky, sigh deeply, and your arms are like waves. I am 30 years old, and my long-cherished wish of recovery has not been realized. Traveling eight thousand miles north and south, the clouds cover the dust and the moonlight is dark. Never, be greedy for pleasure and leisure. If you wait until all your black hair turns white, you will lament in vain. Jingkangnian, the Central Plains completely fell; It is a great shame not to wash the snow, and it is a gnashing of teeth by people with lofty ideals. Swear to drive a chariot and level Helan Mountain. Warriors, drink the blood of the enemy as water, cut the muscles of the enemy as breakfast, play the song of triumph and laugh heartily. By then. From the beginning, the great rivers and mountains in the Central Plains were sorted out to make them look brand-new and spread the good news to the palace frequently.