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1.The process of selective hardening is crucial for the durability of the material.
选择性硬化过程对于材料的使用寿命至关重要。
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2. In metallurgy, selective hardening is used to improve the strength and toughness of steel.
在冶金学中，选择性硬化被用来提高钢的强度和韧性。
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3. During the manufacturing process, selective hardening is applied to enhance the quality of the finished product.
在制造过程中，选择性硬化被应用来提高成品的质量。