What is the receipt for opening the nine-ring chain?

Does the subject want to ask, "What are the gains from unlocking the nine-ring chain?" Exercise your hands and brain. Nine-ring is a kind of intellectual toy that spreads among Shanxi people. It uses nine rings in a string and wins by unraveling them. The gain of unlocking the nine-ring chain is to exercise the flexibility of hands and brains. Jiu Lian Huan is a representative traditional intellectual toy in China, which embodies the traditional culture of China. It is very interesting and can cultivate concentration and patience in study and work. It is really suitable for all ages.