1 sentence

1. 垃圾处理对大城市来说是一个巨大的挑战。

   lā​jī​chǔ​lǐ duì dà​chéng​shì lái​shuō shì yī​ge jù​dà de tiǎo​zhàn.

   Waste disposal is a huge challenge for major cities.

   Source: CCMatrix