OXf.

例句：

1. 1.The ox was the first to break through the gate.
   那头牛是第一个冲破大门的。
2. 2. The farmer used to breed oxen for his farm.
   这位农民过去常为他的农场饲养牛。
3. 3. The ox is a symbol of strength and endurance.
   牛是力量和耐力的象征。