1. power line carrier communication 
   电力线载波通信
2. Listen in on the enemy's communication line 
   监听敌人的通讯线路
3. destroy by firepower, such as an enemy's line of communication. 
   用火力破坏，比如敌人的通讯线。
4. In data communication, a machine action such as carriage return or line feed. 
   在数据通信中的机器动作，如回车或换行。
5. A line of communication between two points in a telephone or similar wired system. 
   电讯线在电话或相类似的有线系统中两端之间的通讯线路

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