The thoughtful reader might propose the charge of the electron as an obvious candidate for the third natural unit.
善于动脑筋的读者，可能提出电子的电荷作为第三个自然单位的明显的候选者。
The thoughtful reader might propose the charge of the electron as an obvious candidate for the third natural unit.
善于动脑筋的读者，可能提出电子的电荷作为第三个自然单位的明显的候选者。
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