同样，第一列对应着空的目标单词，所以它就是删除0,1，…，i个字母的成本。
Similarly the first column corresponds to an empty target word, so it is the cost of deleting 0, 1,..., I letters.
研究所用的阅读材料是四篇英语笑话，其中有十个生词被选为偶然习得的目标单词。
Four jokes were chosen as the reading treatment material, in which ten words were chosen as the target words for incidental acquisition.
研究使用的阅读材料为五篇英语笑话，其中有十一个生词被选为附带习得的目标单词。
Five jokes were chosen as the reading material, from which eleven words were selected as the target words for incidental acquisition.
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