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。
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。
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。
Put back the protective aluminium foil or heavy paper covering.
放回起保护作用的铝箔或厚纸。
Put back the protective aluminium foil or heavy paper covering.
放回起保护作用的铝箔或厚纸。
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