Stirling number

例句：

1. 1.The Stirling number is a mathematical constant that measures the efficiency of a heat engine.
   斯特林数是一个衡量热机效率的数学常数。
2. 2. In thermodynamics, the Stirling number is used to describe the efficiency of an engine in converting energy into work.
   在热力学中，斯特林数用于描述发动机将能量转换为工作的效率。
3. 3. The Stirling number is also used to calculate the maximum power output of a Stirling engine.
   斯特林数还用于计算斯特林引擎的最大输出功率。