The device is an advanced solar cell, no bigger than a typical playing card, which is left floating in a pool of water.
这种器件就是一个很先进的太阳能电池，大小和扑克牌差不多，把它丢到水池里它可以浮在水面上。
The device is an advanced solar cell, no bigger than a typical playing card, which is left floating in a pool of water.
这种器件就是一个很先进的太阳能电池，大小和扑克牌差不多，把它丢到水池里它可以浮在水面上。
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