translation.en: And all of the data, we aligned based on the following idea: Every time my son would learn a word, we would trace back and look at all of the language he heard that contained that word.
translation.zh: 所有的数据 我们都用下述的方法排列： 每次我们发现儿子学了一个新的词 我们就会回溯他听过的这个词的 所有的语言记录