What is the Seventh Amendment?

The Seventh Amendment says that, "In suits at common law, where the value in controversy shall exceed twenty dollars, the right of trial by jury shall be preserved, and no fact tried by a jury, shall be otherwise reexamined in any court of the United States, than according to the rules of the common law."

What does this mean?

"In suits at common law"

This means something in a usual crime case.