alumnae

例句：

1. 1. The alumina is used in the production of glass.
   氧化铝用于生产玻璃。
2. 2.Alumina is a common mineral found in many parts of the world.
   氧化铝是一种在世界许多地方都能找到的常见矿物。
3. 3. The alumina mine is located in the northern part of China.
   中国北部有一个铝土矿。