Many readers of Morse Code: Breaking the Barrier wrote to tell me how the Koch Method had helped them overcome many years of frustration and upgrade their licenses.
许多读者的莫尔斯电码：打破壁垒写信告诉我如何科克方法有助于他们克服多年的挫折和提升其许可证。
Many readers of Morse Code: Breaking the Barrier wrote to tell me how the Koch Method had helped them overcome many years of frustration and upgrade their licenses.
许多读者的莫尔斯电码：打破壁垒写信告诉我如何科克方法有助于他们克服多年的挫折和提升其许可证。
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