请将下面这篇英文短文翻译成中文，并且将翻译结果总结在50字以内：eilionsword sometime is considered the longest existing conventional sword in ancient China. Its exceptional sharpness and durability are attributed to the advanced smelting techniques and rare metal components of the time.
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越王剑被誉为古代中国最长的冷兵器剑，因其                                                                                 采用先进的冶炼技术和稀有金属成分，具有非凡的锋利度和耐用性。
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