mule

Farmers in the mountains often use a mule to carry heavy supplies up steep, rocky trails.

(Chinese) 山里的农民经常用骡子驮着沉重的补给品走在陡峭、多石的小径上。

A mule is typically sterile, meaning it cannot have offspring of its own.

(Chinese) 骡子通常是不育的，这意味着它不能产下自己的后代。