Hua Manlou smiled slightly: "Lu Xiaofeng, do you know? The chopsticks are straight and long, and they are a pair. When using to pick up vegetables, two chopsticks do not move at the same time, but one is active and the other is driven; one is up and one is down. The active one is yang, the driven one is yin; the top one is yang, and the bottom one is yin. Yin, this is the image of two things. The interaction of yin and yang can be used; if yin and yang are separated, this is the mutual root of yin and yang. "But the two chopsticks can be interchanged. The one on the bottom is not always on the bottom. Do you understand?"
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