Subject + 切断 + 了 + Object
The verb 切断 (qiēduàn) means to cut off, sever, or disconnect something. It is used for both physical cutting and abstract disconnection, such as cutting off communication or supply lines. For example, 切断了通信 means "cut off communications."
暴风雨切断了村子的电力供应。
Bàofēngyǔ qiēduàn le cūnzi de diànlì gōngyìng.
The storm cut off the village's power supply.
为了安全起见,他们切断了网络连接。
Wèile ānquán qǐjiàn, tāmen qiēduàn le wǎngluò liánjiē.
For safety's sake, they cut off the internet connection.
敌人试图切断我们的补给线。
Dírén shìtú qiēduàn wǒmen de bǔjǐ xiàn.
The enemy tried to cut off our supply lines.