Selective mutism is a condition occurring in childhood in which a child who is fluent with language frequently fails to speak in certain situations where language is expected.

• 当我决定为身心障碍者制作一系列的纪录片时，我开始想到老师那张尴尬的脸，想到和只有一条腿和一只手臂的父亲一起生活那十多年极其平凡的日子。