importance是抽象名词。抽象名词属于不可数名词。
importancen.重要性；重要；重大
Advanced students need to be aware of the importance of collocation.
层次较高的学生必须意识到词语搭配的重要性。
The importance of the town is due to its geographical location.
这座城镇的重要性在于它的地理位置。
They attach great importance to the project.
他们高度重视这个项目。
