Can be understood as gold futures. The stakes are high.

The characteristic is that the profit is high, the risk is high, and the cycle is very short (a few days ~ March, it seems, generally not long-term), you need to follow closely when doing this, because once you have the margin in CCB gold (That is, RMB) is insufficient, and the system may force the delivery, which means that all the capital will be lost.

It is not uncommon to make money several times. A 30% profit margin is common. Naturally, losses of 30% are also very common.

Wanting to play this requires careful study.