The radio station had an open line on which listeners could call up to discuss various issues.

这家电台开放线路,听众可打电话参加各种问题的讨论.

《简明英汉词典》

In addition, a number facilities such as ATM States does not have the open line.

此外, 一些ATM等 设施建设国开行也不具备.

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Always maintain a positive, tolerant attitude and keep open line of communication to those around you.

对你周围的人们保持积极 、 宽容的态度并让他们能方便地联系你.

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