原发性进展失语症（PPA）是一种罕见的症状，以语言能力的逐渐丧失为特征。

PPA is a rare condition characterized by a steady loss of language skills.

youdao

原发性进展失语症（PPA）是一种罕见的症状，以语言能力的逐渐丧失为特征。

PPA is a rare condition characterized by a steady loss of language skills.

youdao