some important concepts

• 重要概念

some important concepts的用法和样例：

例句

1. Social existence is an important concept in Marxist philosophy.
   社会存在是马克思主义哲学中的一个重要概念。
2. Class midpoint and chronological average both are one of the most important concepts in statistics.
   组中值与序时平均数是统计学中的两个重要概念。