154thirteen years ago, researchers studied a group of 25 infants who showed signs of mild distress when exposed to unfamiliar stimuli such as an unusual odor or a tape recording of an unknown voice.
13年前，研究者研究了一组在受到不熟悉的刺激比如不寻常的气味和未知声音的录音时表现出轻微紧张的25名婴儿。
Thirteen years ago, researchers studied a group of 25 infants who showed signs of mild distress when exposed to unfamiliar stimuli such as an unusual odor or a tape recording of an unknown voice.
13年前，研究者研究了一组在受到不熟悉的刺激比如不寻常的气味和未知声音的录音时表现出轻微紧张的25名婴儿。
Thirteen years ago, researchers studied a group of 25 infants who showed signs of mild distress when exposed to unfamiliar stimuli such as an unusual odor or a tape recording of an unknown voice.
13年前，研究者研究了一组在受到不熟悉的刺激比如不寻常的气味和未知声音的录音时表现出轻微紧张的25名婴儿。
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