The key to their study, though, was in showing that the infants were really imitating the experimenter rather than just sticking their tongues out or opening their mouths for some other reason.
这项实验的关键是确定婴儿的确是在模仿实验者，而不是因为其他原因吐舌头或者张大嘴。
The key to their study, though, was in showing that the infants were really imitating the experimenter rather than just sticking their tongues out or opening their mouths for some other reason.
这项实验的关键是确定婴儿的确是在模仿实验者，而不是因为其他原因吐舌头或者张大嘴。
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