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。

youdao

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。

youdao