What is the poem of two hands with one hammer and one drill rod?

Ode to the Red Flag Canal. One hammer, one brazing and one pair of hands is a sentence in Ode to the Red Flag Canal, which expresses the spirit of self-reliance, hard struggle, unity and cooperation and selfless dedication. Excerpt from Ode to the Red Flag Canal: A hammer and a shovel were carved on the precipice of Taihang Mountain day and night, and 300,000 people covered 10 spring and autumn, gradually spreading the magnificent picture of 1500 km. The small courtyard there witnessed Yang Guifei's brave words.