Probably not: when the experimenter opened his mouth, the infants responded with the same gesture, not by sticking their tongue out.
2
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.
3
实验者吐舌头的时候，婴儿才吐舌头。
And when the experimenter stuck his tongue out, infants stuck theirs out.
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