The focus of the light on the solar cell can also be fine-tuned by changing the air pressure within the balloon, and thus the curvature of the mirror.

借由改变气球内的气压，就可以调整气球反射给太阳能电池的光线焦距，还有气球内的凹面镜弧度。

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The focus of the light on the solar cell can also be fine-tuned by changing the air pressure within the balloon, and thus the curvature of the mirror.

藉由改变气球内的气压，就可以调整气球反射给太阳能电池的光线焦距，还有气球内的凹面镜弧度。

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That is necessary because the balloon concentrates sunlight up to 400 times, and without this cooling the cell would quickly burn out.

水冷式设计之所以必要，是因为这种气球可以集中400倍的阳光，太阳能面板若没有冷却设计，会很快地晒到烧掉。

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The last hot air balloon accident in Luxor occurred in 2009, when 16 foreign tourists were injured after a balloon struck a cell phone transmission tower.

CNN: Deadliest balloon crash in decades kills 19 in Egypt

That is necessary because the balloon concentrates sunlight up to 400 times, and without this cooling the cell would quickly burn out.

ECONOMIST: Monitor