3.A volume means at any point inside that sphere , there is still sphere, not empty space.
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not empty space
不是空的空间
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Among other curiosities, this leads to the startling idea (which has been proved experimentally) that a vacuum is not empty space.
和其他好奇相比，这产生了真空不是“真空”的惊人想法(已得到试验证实)。
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Space is not just an empty void between point A and point B.
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