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1.This stainless steel ball is perfect for grinding coffee beans.
这个不锈钢球非常适合磨咖啡豆。
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2.The engineer used a stainless steel ball to polish the machine.
工程师用一个不锈钢球来抛光机器。
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3.The stainless steel ball was so sharp that it could cut through even the hardest material.
这个不锈钢球非常锋利，甚至可以切割最坚硬的材料。