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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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Angle iron is specified at the edges as a protective device for the covering plate.
按照规定，盖板边缘加装角钢起保护作用。
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Angle iron is specified at the edges as a protective device for the covering plate.
按照规定，盖板边缘加装角钢起保护作用。
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