研究人员承认，他们不确定为什么男性和女性对笑容的反应不同。

The researchers admit they are not sure why men and women reacted differently to smiles.

youdao

研究人员承认，他们不确定为什么男性和女性对笑容的反应不同。

The researchers admit they are not sure why men and women reacted differently to smiles.

youdao