Natural silk is believed to have been discovered in China thousands of years ago. An ancient Chinese legend tells that the wife of the Yellow Emperor, Lei Zu, discovered the benefits of raising silkworms and introduced the technique to China.
Silkworms are raised on mulberry leaves, and they spin their cocoons with a protein-rich substance called natural silk. The cocoons are collected and then boiled to preserve the silk fibers. Then the natural silk is spun into thread, which can be woven into textiles like brocade and damask.
During the Han Dynasty, silk production rapidly increosed and the silk trade and export flourished. The Silk Road, which connected China to Central Asia, Western Asia and Europe, became a crucial economic link. Silk was traded for other luxury goods such as precious metals, spices.
The Tong Dynasty was the heyday of silk production, which reached unprecedented levels in terms of output quality, and variety.
翻译：
天然丝绸被认为是数千年前在中国发现的。一个古老的中国传说告诉，黄帝的妻子雷祖发现了养蚕的好处，并将养蚕技术引入了中国。
蚕是在桑叶上长大的，它们用一种名为天然丝的富含蛋白质的物质来结茧。蚕茧被收集起来，然后煮沸以保存丝绸纤维。然后将天然丝绸纺成线，可以织成锦缎和锦缎等纺织品。
汉代，丝绸产量迅速增长，丝绸贸易和出口蓬勃发展。连接中国与中亚、西亚和欧洲的丝绸之路成为至关重要的经济纽带。丝绸被用来交换其他奢侈品，如贵金属、香料。
唐代是丝绸生产的鼎盛时期，产量、品种都达到了前所未有的水平。
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阅读下面的材料，根据要求写作。(60分)优质的土壤，可以培育出优质的农作物，结出丰硕的果实；优质的土壤，可以为人生打下良好的根基，可以承载一个民族的文化信仰……土壤是有营养的。
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