她摸着自己的胸笑了。

Tā mōzhe zìjǐ de xiōng xiàole.

She laughed and touched her chest.

心脏在胸腔里。

Xīnzàng zài xiōngqiāng lǐ.

The heart is in the chest.

我的胸有点闷。

Wǒ de xiōng yǒudiǎn mēn.

My chest feels a bit stuffy.