As long as preg_replace() finds a match, the loop must continue, which explains the condition $old != $pretty_print.
只要 preg_replace()找到匹配，循环就必须继续，这解释了 $old ! = $pretty_print条件。
The calculation result is basic to match the actual condition.
计算结果基本符合实际状况。
The match was abandoned at half time because of the poor weather condition.
因为天气不好，比赛举行到中途就停止了。
The match was abandoned at half time because of the poor weather condition.
因为天气不好，比赛举行到中途就停止了。
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