英语翻译He could also send many signals with a mirror.He usually used the mirror to warn someone of danger.Or he tried to get the attention of a person far away.But he also used ig to send messages in code.Of course,mirrors could be used only when the sun was shining.At night,Indians used fire arrows for signaling.An Indian also sent signals with smoke.He made a small fire of dry wood.Then he put grass of green branches on it.He held a blankt over the fir

英语翻译
He could also send many signals with a mirror.He usually used the mirror to warn someone of danger.Or he tried to get the attention of a person far away.But he also used ig to send messages in code.Of course,mirrors could be used only when the sun was shining.At night,Indians used fire arrows for signaling.
An Indian also sent signals with smoke.He made a small fire of dry wood.Then he put grass of green branches on it.He held a blankt over the fire for a minute.When he removed the blanket from the fire,there was a cloud of smoke.The number of clouds of smoke told his message in code.
Now you can see that Indians didn`t need to learn each other`s language.They could talk to one another by using signals or sign language.