bronze bearing

例句：

1. 1. The bronze bearing on the door is worn out.
   门上的铜制轴承已经磨损了。
2. 2. The bronze gear was a common sight in ancient times.
   铜制齿轮在古代很常见。
3. 3. The bronze gear has been used for centuries as a reliable source of power.
   铜制齿轮被使用了几个世纪，作为可靠的动力源。