A Syrian volunteer takes part in the restoring work of a school in the Kafar Batna area, once controled by rebels, in eastern Damascus, Syria, June 3, 2018. (Xinhua/Ammar Safarjalani)

Syrian volunteers take part in the restoring work of a school in the Kafar Batna area, once controled by rebels, in eastern Damascus, Syria, June 3, 2018. (Xinhua/Ammar Safarjalani)

A Syrian volunteer takes part in the restoring work of a school in the Kafar Batna area, once controled by rebels, in eastern Damascus, Syria, June 3, 2018. (Xinhua/Ammar Safarjalani)