yak

例句：

1. 1. The yak is a large animal that can be found in the mountains of Tibet.
   牦牛是一种可以在西藏山区找到的大型动物。
2. 2. The yak is an important source of food for many people in the region.
   牦牛是该地区许多人的重要食物来源。
3. 3. The yak is also known for its strong and enduring nature.
   牦牛因其强壮和持久的特性而闻名。