中文：

回马枪是古代骑兵的一种作战方式，指的是在策马回头时，迅速用枪向身后刺击敌人的动作。这种作战方式在古代战争中具有重要的作用，能够有效地攻击敌人的后方，打乱敌人的阵脚，提高自己的战斗力。

在现代汉语中，“回马枪”这个词汇已经不再局限于军事领域，而是被广泛地运用到各种场合，比喻在完成某项任务或者达到某个目标之后，突然回头反戈一击的行为。这种行为通常出现在竞争激烈的环境中，当事人为了获得更多的利益或者占据优势地位，而采取的一种策略。

英文：

The term "hui ma qiang" in ancient times referred to a combat method of cavalrymen, who would use their spears to attack the enemy behind them when turning around on their horses. This combat method played an important role in ancient wars, as it allowed for effective attacks on the enemy's rear, disrupting their formation and enhancing one's own combat effectiveness.

In modern Chinese, the term "hui ma qiang" has been widely used in various situations beyond the military context. It比喻the act of suddenly turning around and attacking the enemy after completing a task or achieving a goal, often employed in a fiercely competitive environment as a strategic move to secure more benefits or gain an advantage.