This is an 8-volt battery.

这是一个8 V的电池。

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Now, you will need a common nine-volt battery and a metal piece of money.

现在你需要一节普通的9伏电池和一枚金属钱币。

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Now, you will need a common nine-volt battery and a metal piece of money.

现在你需要一节普通的9伏电池和一枚金属钱币。

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