Prader-Willi syndrome

例句：

1. 1. The child's behavior was unusual and caused concern for his parents.
   这个孩子的举止异常，让父母很担心。
2. 2. The diagnosis of Prader-Willi syndrome is often associated with severe intellectual disability.
   普拉德-威利综合征的诊断往往与严重的智力障碍有关。
3. 3.Researchers are trying to understand the underlying causes of Prader-Willi syndrome.
   研究人员正在试图理解普拉德-威利综合征背后的根本原因。