Locking an order is not deferred liquidation. The function of lock order is to keep the position from losing too much when you lose money or expect to lose money.

Suppose you judge that sugar is bearish in the middle line, and you sell a lot of sugar, but sugar can still fluctuate upward in the short term. At this time, you can buy in large quantities and lock positions when the price of sugar rises. No matter how much sugar goes up, your biggest loss is the difference between your two orders. When the short-term fluctuation of sugar ends and continues to fall, you can level the lock list and leave only the empty list.