expansion

n.

1. 扩大, 扩张, 扩展, 膨胀
   • Heat causes the expansion of gases.
     热使气体膨胀。
2. 扩张物, 膨胀物
   • His big book is an expansion of the little book he wrote before.
     他这本大部头的书是在他以前写的一本小册子的基础上扩充而成的。