Brass: Alloy of copper and zinc, important for its hardness and workability.
黄铜：铜和锌的合金，硬度和可加工性让它成为重要的合金。
For other purposes, its hardness and strength can BE improved by adding various amounts (up to 12%) of antimony alone.
对于其他用途来说，只消在铅中加进不同量的锑(不超过12%)，就可提高其硬度和强度。
The EDM process is valued for its ability to machine complex shapes in metals of any hardness.
电火花加工的可贵之处在于它可在任何硬度金属上加工复杂形状。
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