4 sentences

1. 自行车的闸坏了，得赶紧修。

   zì​xíng​chē de zhá huài le, děi gǎn​jǐn xiū.

   The bicycle brakes are broken and need to be fixed right away.

   Source: Dong Chinese Dictionary

2. 离开房间前，请把电闸关掉。

   lí​kāi fáng​jiān qián, qǐng bǎ diàn zhá guān​diào.

   Please turn off the main switch before leaving the room.

   Source: Dong Chinese Dictionary

3. 把这条河闸住，引水灌溉农田。

   bǎ zhè tiáo hé zhá zhù, yǐn​shuǐ guàn​gài nóng​tián.

   Dam up the river to divert water for field irrigation.

   Source: Dong Chinese Dictionary

4. 干旱季节，管理人员会准时开启水库的闸。

   gān​hàn jì​jié, guǎn​lǐ rén​yuán huì zhǔn​shí kāi​qǐ shuǐ​kù de zhá.

   During the dry season, the managers open the reservoir's sluice gates on schedule.

   Source: Dong Chinese Dictionary