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1.The ancient city is covered with a layer of smooth stones.
这个古老的城市被一层光滑的石头覆盖。
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2. He carefully picked up the large stone and placed it on the ground.
他小心翼翼地捡起那块大石头，放在了地上。
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3. The builders used stones to build the walls of the castle.
建筑师们用石头建造了城堡的墙壁。