A trained signaller can tap out messages at treat speed on the Morse key.
A trained signaller can tap out messages at treat speed on the Morse key.
受过训练的通信员可用莫尔斯键快速发电报。
A trained signaller can tap out messages at treat speed on the Morse key.
受过训练的通信员可用莫尔斯键快速发电报。