This is the 2011th most frequent Chinese word.
要素
"要素" means "essential element" or "key factor."
In this sentence, "要素" is used to refer to essential components or elements in a design context.
设计需要很多重要要素，比如颜色和布局。
Design requires many important elements, such as color and layout.
Here, "要素" is used metaphorically to describe a person's critical role or function as an 'element' of a team.
他是团队中不可或缺的要素。
He is an indispensable element in the team.
"要素" in this context signifies the fundamental aspects or components that constitute education.