Take iron ore as an example to explain to you. For example, the current price of iron ore is 500, the leverage is 100, and the exchange now stipulates that the deposit is 10%, so you can use 500 times 100 times 10% to buy primary iron ore, that is, 5000 pieces. Your account has 6000 yuan, so after you buy 5000 yuan iron ore, the balance is 1000 yuan. But the price of iron ore has dropped by 15 points, and your balance is 1000- 1500=-500. At this time, the exchange has changed the deposit to 15% to make primary iron ore, so trading primary iron ore is 490 times 100 times 15% = at this time, you owe the exchange 7350-4500=2850 yuan. So the exchange will call you, or add a deposit of 2850 yuan, otherwise it will close the iron ore in your hand. After the liquidation, your account still has 4500 yuan.

I'm exhausted from typing so many words!