progression

n.

1. (事件的)连续; 一系列
   • A progression of disagreements has led to war between those nations.
     一连串的不和导致那些国家之间爆发了战争。
2. 〈数〉级数
   • Population is increasing in that country in a geometric progression.
     那个国家的人口正以几何级数增长。