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Protons are so small that a little dib of ink like the dot on this i can hold something in the region of 500 billion of them, rather more than the number of seconds contained in half a million years.

像字母i上的点这样大小的一滴墨水,就可拥有约莫5000亿个质子,说得更确切一点,要比1.5年的秒数还多。

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3G, 401(K), a,
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