Mar.

例句：

1. 1. The horse is a symbol of strength and courage.
   马是力量和勇气的象征。
2. 2. The horse has been ridden by many generations of humans.
   马被许多代人类骑过。
3. 3. The horse was the first to cross the finish line in the race.
   马是第一个在比赛中冲过终点线的。