3 sentences

1. 他被派往亚伦负责这个跨国援建项目。

   tā bèi pài wǎng Yà​lún fù​zé zhè gè kuà​guó yuán​jiàn xiàng​mù.

   He was sent to Yaren to oversee this transnational aid construction project.

   Source: Dong Chinese Dictionary

2. 他下个月要动身去中非负责一项援建工程。

   tā xià gè yuè yào dòng​shēn qù Zhōng Fēi fù​zé yī xiàng yuán​jiàn gōng​chéng.

   He is leaving for Central Africa next month to oversee an aid construction project.

   Source: Dong Chinese Dictionary

3. 我有一个朋友在刚果援建铁路，已经两年没回家了。

   wǒ yǒu yī gè péng​you zài Gāng​guǒ yuán​jiàn tiě​lù, yǐ​jīng liǎng nián méi huí​jiā le.

   I have a friend who is helping build a railway in the Congo and hasn't been home for two years.

   Source: Dong Chinese Dictionary