2 sentences

1. 他总是问一些非常弱智的问题。

   tā zǒng​shì wèn yī​xiē fēi​cháng ruò​zhì de wèn​tí.

   He always asks very idiotic questions.

   Source: Dong Chinese Dictionary

2. 那个机构致力于为弱智儿童提供特殊教育。

   nà gè jī​gòu zhì​lì yú wèi ruò​zhì ér​tóng tí​gōng tè​shū jiào​yù.

   That institution is dedicated to providing special education for children with intellectual disabilities.

   Source: Dong Chinese Dictionary