disappeared without a trace meaning in English

消失得无影无踪

Why did civilization disappear without a trace when it once dwarfed all surrounding countries ?
曾经使周围许多国家瞠乎其后的文明为什么竟消失得无影无踪？
And then they disappear without a trace
接着它们消失的无影无踪
And then they disappear without a trace
接着它们消失的无影无踪
And then they disappeared without a trace
而且一点痕迹都没留下
And then they disappeared without a trace
而且一点痕迹都没留下

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