Reverse use means that according to the needs of expression, after defusing other people's sentences, reassemble them and integrate them into their own works, the meaning expressed is contrary to the original meaning
Original sentence: Attack unprepared. We cannot attack the retreating army, nor can we pursue and kill the desperate enemy. We should take advantage of this good opportunity of the enemy's decline and prosperity to catch up with and cripple the enemy and liberate the whole of China. Do not learn from Xiang Yu, the overlord of Chu, who was greedy for false fame and indulged the enemy and caused his own failure.