For the same reason, we all have similar emotional expressions like smiling and crying.

基于同样的原因，我们都拥有哭和笑这样类似的情感表达。

youdao

For the same reason we all have similar emotional expressions like smiling and crying.

基于同样的原因，我们也拥有哭和笑这样类似的情感表达。

youdao

When we were born, we were crying, and the people around us were smiling.

我们出生的时候，我们哭着，身边的人笑着。

youdao

He was smiling, and crying into his lovely beard.

NEWYORKER: A Tiny Feast

From 26 weeks, they appear to exhibit a whole range of typical baby behaviour and moods, including scratching, smiling, crying, hiccuping, and sucking.

BBC: NEWS | Health | Scans uncover secrets of the womb

The baby notices and tries to re-engage with her by smiling, then by pointing, then shrieking and finally crying.

WSJ: Why We Pair Up With Our Emotional Opposites and Relationship Advice for Making It Work