光要求：充分阳光只。
他们在房间中不使用百叶窗。窗帘不能充分的遮蔽阳光。
They do not use blinds in their houses and the curtains do not fully protect from the sunlight.
这个的优势，他说，在于小粒子在阳光下和水中会有更大的表面积，就能更充分的吸收阳光。
The advantage of that, he says, is that the small particles would have much more surface area exposed to sunlight and the water, allowing them to harness the sun's energy more efficiently.
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