1 sentence

1. 他在窗户上装了铁栏杆，以防小偷进来。

   tā zài chuāng​hu shàng zhuāng le tiě lán​gān, yǐ​fáng xiǎo​tōu jìn​lái.

   He installed iron bars on the windows to prevent thieves from entering.

   Source: Dong Chinese Dictionary