The operation of using a telegraph key .

使用 电报 按键的操作过程。

Like Sammuel morse 's work on the telegraph bell 's determination also to do what seemed impossible was the key to his success .

象塞缪尔莫尔斯致力于 电报一样，贝尔取得成功的 关键也在于决心做似乎不可能做到的事。