I'll keep my line open for you.

我会保持线路通畅等你来电。

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This meant that land south of the line would be open to slavery.

VOA: special.2009.03.19

The guns tore open big holes in the Confederate battle line.

VOA: special.2009.11.05

The Germans,by a remarkable combination of air bombing and heavily armored tanks, have broken through the French defenses north of the Maginot Line, and strong columns of their armored vehicles are ravaging the open country, which for the first day or two was without defenders.

VOA: special.2011.05.12

She declined to talk further so that she could keep her phone line open.

NPR: Loved Ones Seek Word On Boston Runners After Blast

Trying to keep that supply line open and clear and they did, but not without a cost.

CNN: Martin Savidge: 'Pitched battle that went on and on'

Offshore production "is actually pretty critical to keeping that line open, " said Patrick Burden, president of Northern Economics.

WSJ: Drilling Rules Hit Alaska Pipeline