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Interpret - a Christian perspective
Speaking in tongues is described here as a gift of the Spirit, but it's not as helpful to the church unless there is somebody with the ability to interpret what is being said for believers to understand.
http://biblegateway.com/passage/?search=1%20Corinthians%2014:5&version=NIV
The Holy Spirit Comes at Pentecost :: Acts 2
When the day of Pentecost came, they were all together in one place. Suddenly a sound like the blowing of a violent wind came from heaven and filled the whole house where they were sitting. They saw what seemed to be tongues of fire that separated and came to rest on each of them. All of them were filled with the Holy Spirit and began to speak in other tongues as the Spirit enabled them.
http://biblica.com/bible/verse/index.php?q=Acts2