The authors' plan calls for 3.8 million large wind turbines, 90, 000 solar plants, and numerous geothermal, tidal and rooftop photovoltaic installations worldwide.
2
从外部看，该被动式住宅与其它的住宅，几乎没有什么区别——要不是有光伏太阳能发电系统安装在屋顶上。
Externally, there is almost nothing to distinguish their passive house from the other buildings - except for the photovoltaic installation on the roof.
3
他们一边朝南的屋顶安装光伏太阳能发电设备。
They have installed a photovoltaic unit on the south-facing side of the roof.
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