lǎo / shī / yòng / mò / ěr / sī / diàn / mǎ / gěi / wǒ / men / yǎn / shì / le / rú / hé / fā / sòng / xìn / hào

老师用莫尔斯电码给我们演示了如何发送信号。

The teacher used Morse code to demonstrate how to send a signal.