From the construction of rationals, we know that the spacing between them is arbitrarily close, but at any “magnification level” — for any chosen denominator b — the values divide the continuum into uniform intervals. Uniform spacing also implies maximal spacing: even though there is no upper or lower bound to the values of a / b, they are as far apart as they can be. Any new value inserted onto the number line will necessarily sit “closer” to an existing rational.
这五年，河湖复苏见证生态蝶变。断流百年的京杭大运河连续4年全线水流贯通，断流二十六载的永定河碧波荡漾。越来越多的幸福河湖，正在成为百姓家门口的“诗和远方”。
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