做到这一点的唯一方法，是把获得免费校餐的孩子的考试成绩单独列出：只有穷人才能获得免费食物。
The only way to do that is to separate out the exam results of children who get free school meals: only the poor get free grub.
您还可以重用我前面给出的一个命令来截取在此时间期限中得到处理的所有唯一ID，并为每个线程生成单独的线程日志。
You can also reuse a command I gave you earlier to strip all the unique IDs that were being processed during this timeframe and generate separate thread logs for each.
然而，我不再认为在非洲的一个地区曾经有过单独一小群人，我们都是他们唯一的后裔。
However, I no longer think that there was ever a single small population of humans in one region of Africa from whom we are all uniquely descended.
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