火腿弹出大学-咸大学包括摩尔斯电码的经验教训，分级练习，和游戏。

Ham University pop - Ham University includes Morse Code lessons, graded exercises, and a game.

youdao

火腿弹出大学-咸大学包括摩尔斯电码的经验教训，分级练习，和游戏。

Ham University pop - Ham University includes Morse Code lessons, graded exercises, and a game.

youdao