In initial testing, the amount of power produced was vanishingly small — just 15 picowatts, or trillionths of a watt, per square centimeter of metal plate.

在初始测试阶段，能够获得的电能是极其微小的——每平方厘米的金属片只有15皮瓦(百亿分之一瓦)。

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And each one of those cars has this ten-centimeter metal plate.

这两辆车，都有10厘米的金属板。

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The grooves are only a few thousand atoms deep and must be uniform across an entire 15-centimeter plate.

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The centerpiece of the new robotic shell is a 5 square centimeter hexagonal plate or circuit board.

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