大阳可提供光能，热能和电能。
而太阳能可以直接或间接地转化成其他的能量形式，如热能和电能。
Solar energy can be converted directly or indirectly into other forms of energy, such as heat and electricity.
热能和电能是建筑必需的能量形式，因此在太阳能建筑中热水和光伏系统应同时考虑。
Heat and electricity are necessary energy forms in building. Therefore, the water heating system and photovoltaic system should be taken into account at the same time in solar building.
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