The resulting steel appears to achieve a combination of strength and toughness that is comparable to that of modern steels that are very rich in alloy content and, therefore, very expensive.
2019年6月六级真题（第三套）阅读 Section A
柯林斯高阶英汉双解学习词典释义
N-MASS
合金
An alloy is a metal that is made by mixing two or more types of metal together.
1. a mixture containing two or more metallic elements or metallic and nonmetallic elements usually fused together or dissolving into each other when molten;
"brass is an alloy of zinc and copper"
2. the state of impairing the quality or reducing the value of something
Verb
1. lower in value by increasing the base-metal content