material作为材料可数吗？
Material本身可数，作“材料”讲不可数。但是在这里作可数名词。因为后面跟了定语从句，说明这里的material是什么材料。 例如：
1.The material of the suit is wool.（复数的）这套西服的材料是羊毛的。
2.This kind of cloth made of polyester doesn't wear well．这种涤纶做的布料不耐磨。
3.You can buy these shirts in three different materials.这三种不同的材质你可以买到。
4.What are you doing with all this paper？ I need to recycle some material 这些纸你都干什么用呢？我得回收一下材料了。 然而如果单独使用，则表示“本质”“性质”的意思，此时是不可数的。
例如：
5.The material difference between the two words has escaped me.这两个词之间的细微差别我忘了。
6.She was too shy to speak about her material needs.她太腼腆了，不好意思说出自己的需求。
7.It's high time we bought some new office equipment-the most important being computers and printers.现在是购买新办公设备的时候了-最重要的是买电脑和打印机。
8.I wanted something which would work for both heat and cold－a good insulating material.我想找一种既可以保温又可以防热的材料。