以下为句子列表：
英文: Pins are made of high-strength steel and have a hollow center. Many pins are chrome-plated to help them wear better.
中文: 销由高强度的钢做成并且是空心的。很多销都是镀铬的以使他们更加耐磨。
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英文: Weldable materials: low carbon steel , high-strength steel ,medium-carbon steel, low-alloy steel.
中文: 可焊材料：低碳钢、高强度钢、中碳钢，低合金钢。
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