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客人:
What is the use of these small pieces of stones? 
请问这些小块儿的石头是做什么用的？
服务员:
Engravers cut seals on them. Seal cutting is a typical Chinese art， with a history of more than 2，000 years.
篆刻人刻章用的。刻章是中国特有的艺术，有2000多年的历史了。