... 防盗盖 tamperproof seal,pilferproof closure 封闭物 closure 复合包装材料 multi-layer packaging material ...
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采用热失重分析和红外光谱对封闭物的脱封反应进行了研究。
The deblocking reactions of the prepared blocked polyisocyanates were investigated by thermal gravimetric analysis and FT-IR.
我们必须想象早期的地球是岩石材料、金属和封闭气的混合物，受到较小的星子的持续轰击，没有多少大气。
We must imagine the early Earth as a mixture of rocky materials, metals, and trapped gases, subject to constant bombardment by smaller planetesimals and without much of an atmosphere.
如果没有封闭它，那么就可以尝试在这里画某类环状物。
Well, if you don't quite close it all the way around, so I can try to, indeed, draw some sort of doughnut here.
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