people can understand each other using sign language ,using sign language 做什么成分

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• 英语翻译Each Indian tribe had a different language.Many Indians never learned any language except their own.Do you know how Indians from different tribes talded to each other?They had two ways to talk without sound.One way was by sign language; another was by signals.Sign language is a way of talking bu using sign.Indians used sign language when they met strangers.In this way,they could find out whether the stranger was a friend or an enemy.In Indian sign
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