Tongue protrusion-retraction is critical to early nutrition but is also a gustatory-olfactory aspect of early infant social behaviour that is, in part, reliant on pre-natal exposure and learning. Most early development is necessarily dyadic and intrinsically associated with other aspects of social functioning.

中文翻译：

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“两个人才能知道一个”——舌头突出-收缩只是早期主体间性的一小部分

舌头前伸收缩对早期营养至关重要，但也是早期婴儿社会行为的味觉嗅觉方面，部分依赖于产前接触和学习。大多数早期发展必然是二元的，并且在本质上与社会功能的其他方面相关。