It is a metaphor for long-distance running in battle. It also refers to the distance of the journey.
The words come from Yue Fei's poem "The River is Red" in the Song Dynasty: Angry hair rushes to the crown, leaning on the railing, the mist rain stops. Lift our sight, the sky and shouts, grand, vehement. Thirty years of fame and dust, eight thousand miles of clouds and moon. Don't wait any longer. The young man's head will turn gray, and he will be filled with sorrow. The shame of Jingkang is still not over. When will the hatred of the ministers be destroyed? Driving a long car, crossing the gap in Helan Mountain. The ambition is to eat the meat of Huns when they are hungry, and to drink the blood of Huns when they are thirsty. Be from scratch, clean up the old mountains and rivers, overturned Que.
The most famous inheritance and interpretation of Yue Fei's poem "Thirty years of fame and dust, eight thousand miles of clouds and moon" is another famous saying of Dr. Sun Yat-sen: The revolution has not yet succeeded, comrades still have to work hard. .