diversity 可数吗

　　Two of our greatest strengths are diversity and community.

　　我们最大的两个优势是多样性和团体精神。

　　We have nothing against diversity; indeed, we want more of it.

　　我们一点都不抵触多样化；实际上，我们需要多样性更丰富一些。

　　His object is to gather as great a diversity of material as possible.

　　他的目标就是尽可能多地搜集各种材料。

　　Few countries have as rich a diversity of habitat as South Africa.

　　几乎没有哪个国家像南非那样拥有如此多样化的动植物栖生地。

　　A key issue for higher education in the 1990's is the need for greater diversity of courses.

　　20世纪90年代，高等教育的一个重要议题是要使课程更加多样化。