The beginning of exposure to these, there should be doubt. What is the Morse code thing?

The Morse telegraph and workable code was first demonstrated in 1844. When a message was received, a series of short or long dashes (‘dots’ and ‘dashes’) were recorded onto a moving strip of paper. The pattern of the dots and dashes could be interpreted using Morse’s Alphabetical Code.

I would like to briefly explain Morse code is similar to the meaning of the signal.For example, the distance to the exposure of a flashlight, if carried out in accordance with the identification of different frequencies, one may find that, in fact, it is with meaning.If you are at the seaside to see the water far away from the beach there is a bright light a light, you may wish to look carefully to identify.If we see the light in accordance with the "short-short light dark light dark light dark short dark long light long light  long dark light dark light dark short dark short-short bright light" to show this pattern, then it means that the distress signal, SOS .

As matter of fact,you can design a sound system of their own.Just like"da da di P. da da da P. da da da P. da di di P. di P. di di di da P. di P.da di P. di diP .da di P. da da di  " (P.=Pause)

Which translation is :
da da di    G
da da da    O
da da da    O
da di di    D
di          E
di di di da V
di          E
da di       N
di di       I
da di       N
da da di    G

Good Evening!
Follow-up, a joke that,I won’t expose the students who  use morris code in the test.Because it is a kind of capability, just need proper guidance.