1.0planet forward//www.getitdoneaz.comnon encrypted//www.getitdoneaz.com/author/nonencrypted/heliostat home heater - planet forward - 克罗地亚vs加拿大让球
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a heliostat is a special mirror with a guidance device that can keep sunlight reflected toward the same target all day without straying off-target. it is just a mirror but you need to keep it trained on the same spot for it to work. it is a bit like a telescope with a tracking device,...