金属就是通常具有良好导电性和导热性的元素。许多金属具有高强度、高硬度以及良好的延展性。
Metals are elements that generally have good electrical and thermal conductivity. Many metals have high strength, high stiffness, and have good ductility.
工程陶瓷因为具有极高的硬度、良好的耐磨耐蚀性和很高的脆性，使其成为难加工材料。
Engineering ceramic materials are difficult to machine because of their outstanding properties, such as high hardness, high wear resistance, high erosion resistance and high brittleness.
硬质橡胶是一种具有高强度、高硬度、高模量以及良好无缺口抗冲击强度的特种橡胶制品。
Ebonite is one kind of special rubber product with high strength, high modulus, high hardness and fine unnotched impact resistance.
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