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And they found that the protective covering is actually only 6 nanometers thick.
他们发现，保护层其实只有6纳米厚。
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This prehistoric animal grew a thick protective covering.
这种史前动物长着一层厚厚的保护性外皮。
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This prehistoric animal grew a thick protective covering.
这种史前动物长着一层厚厚的保护性外皮。
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