派生词是complexity，中文意思是n. 复杂性，错综复杂复杂之处，费解之处

I was astonished by the size and complexity of the problem.这个问题的复杂性和涉及面之广使我感到惊讶。

This technological shift causes profound changes in the complexity of African societies.

这种技术上的转变使非洲社会复杂性发生了深刻的变化。