3.A volume means at any point inside that sphere , there is still sphere, not empty space.
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It is not empty space because space is something.
它不是空空如也的空间，因为空间是有。
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)。
Whitespace does not have to be white in color, instead, it is merely empty space that provides spacing and cushioning for the rest of the design elements.
空白不是必须用白色的，而是，它仅仅是为其他设计元素提供间隔和缓冲的空间。
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