The convector pits are covered with convrete grids that are prefabricated for building pigsties.
供热器常用在猪上的混凝覆盖。
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Buildings can become greener. They can use more recycled steel and can be prefabricated in off-site factories, greatly reducing lorry journeys. But no other building material has environmental credentials as exciting and overlooked as wood.
建筑可以变得更绿色。它们可以增加再生钢材的使用,还可以在工地外的工厂中 预制组件,大大减少对货运的需求。但各种建筑材料中,具有最让兴奋的环保特性却也最受忽视的还是木材。