2 sentences

1. 这两条铁路干线在郑州交会。

   zhè liǎng tiáo tiě​lù gàn​xiàn zài Zhèng​zhōu jiāo​huì.

   These two main railway lines intersect in Zhengzhou.

   Source: Dong Chinese Dictionary

2. 由于干线正在维修，往返两地的客车只能临时绕道。

   yóu​yú gàn​xiàn zhèng​zài wéi​xiū, wǎng​fǎn liǎng dì de kè​chē zhǐ néng lín​shí rào​dào.

   Because the main road is under repair, buses traveling between the two locations have to take a temporary detour.

   Source: Dong Chinese Dictionary