translation.en: But these babies, of course, here stand in for groups of babies, and the differences you're going to see represent average group differences in babies' behavior across conditions.
translation.zh: 当然，这两个婴儿， 各代表一类婴儿， 你们即将看到的差别， 代表了婴儿在不同情况下 普遍的行为差异。