Secondly, when the price is 2000, if you want to sell, you should hang up the contract, not to force the other party to buy, but to see if anyone in the market is willing to buy. It's that simple.

If the price falls, there is a risk control regulation. At some point, you need to close your position by force, as long as you look at your capital ratio and fund management.

You can contact me if you still don't understand.