"The lungs are organs for breathing. When you breathe in, a feeling of hiding deeply. When you breathe out, it is to reveal everything. We can see it as the "Metal" element. Some are in the form of minerals. At the stage when it is buried deep in the ground, it could be seen as sharpening its quality. In the viewpoints of the five elements in Ancient China, "Metal" complements "Water". Water nourishes life. The oxygen that fills the lungs will eventually be dissolved in the blood and brought to various parts of the body for metabolism. And what is blood made of? It's water! Isn't this a practical illustration of "Metal" complements "Water"?
Not only was Lou Cheng's explanation of Cultivation not accurately translated, but he also made some modifications to it.