我觉得这么理解通一些：
cutting tools are made from the materials which are all characteristically hard and strong.
也就是说“切割工具都是有一些非常坚硬的材料做成的”make from(由……构成）
后面的句子：有许多工具材料可用于加工作业.综合的（要看全文来定了）分类和材料的用途再次有很重要作用.
英语翻译The materials from which cutting tools are made are all
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