2 sentences

1. 他在管理方面表现得相当低能。

   tā zài guǎn​lǐ fāng​miàn biǎo​xiàn de xiāng​dāng dī​néng.

   He has shown himself to be quite incompetent in management.

   Source: Dong Chinese Dictionary

2. 这所康复中心专门为低能儿童提供特殊教育。

   zhè suǒ kāng​fù zhōng​xīn zhuān​mén wèi dī​néng ér​tóng tí​gōng tè​shū jiào​yù.

   This rehabilitation center specializes in providing special education for children with intellectual disabilities.

   Source: Dong Chinese Dictionary