并且还有两块太阳能电池板（一块在屋顶，另一块在后院）这两块电池板在有阳光的时候贮存电能，并通过两个不同的系统来提供照明用电和热水。

There are two photovoltaic arrays (one on the roof, another in the backyard) that produce electricity on sunny days, and a separate system that provides solar hot water.

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整个工厂需安装有足够的紧急照明系统(带有备用电池)。

Adequate emergency lighting (with a battery back-up) should be installed throughout the factory.

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应该把使用电池的应急灯安装在楼梯间等地方，以便在断电的情况下为人们提供照明。

Should extend the use of the emergency lights battery installed on the stairs, so that in the case of a loss of power to the people.

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