Many people have already installed insulation and double-glazing, but more is to be done.
许多人已经安装了绝缘和双层玻璃，但这些还远远不够。
Skin made by the metal and liner made by double-glazing.
外皮由铁皮制成，内装双层玻璃制成的瓶胆。
The noise was so loud it even penetrated the double glazing .
噪音强到可以穿透双层玻璃。
The noise was so loud it even penetrated the double glazing .
噪音强到可以穿透双层玻璃。
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