1 sentence

1. 他的旧衣服上不知在什么时候磨出了好几个大窟窿。

   tā de jiù yī​fu shàng bù zhī zài shén​me shí​hou mó chū le hǎo​jǐ gè dà kū​long.

   At some point, several large holes had been worn into his old clothes.

   Source: Dong Chinese Dictionary