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读下面的文章，然后回答文章后的问题。
In 1974, when farmers were digging a well in China, they had a surprising discovery : a life-sized statue (雕像)of a soldier. Over the years, a great army made of terracotta(赤陶) has been discovered in the area.
The statues are from the tomb(坟墓)of China's first emperor. Experts are very surprised how real they are. Each soldier is dressed differently and has a unique(独特的) face and hairstyle. Now, a new study suggests that the statues may have been made to look exactly like the soldiers who protected Emperor Qin Shi Huang.
In 221 BC, Emperor Qin Shi Huang unified(使统一)China. He ordered about 700, 000 workers to build an underground palace for him. It's believed that the terracotta army was meant to guard the tomb and protect Qin，who thought he would continue to control the country in the afterlife(来世).
Did the workers use actual soldiers in Qin's army as models for the statues ?To test this, scientists from China and Great Britain took digital photos of the statue's ears. Why ears? One reason is that in real life, everyone's ears are unique. The scientists have compared the ears of 30statues.They've found that each one is unique—meaning it's possible that the statues were modeled(模型化的) on real-life soldiers.
Scientists have been discovering secrets of the terracotta army for years. They believe that there are about 8, 000 statues in all. So far, they have discovered only about 2,000.Many of the soldiers are still in deep underground—as the body of the owner himself.
