We might even encounter an alien type II civilization long before we achieve that level ourselves.

我们也许甚至会在自己远未达到第二阶段水平时就遇到了那个阶段的外星文明。

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Barrowman's character is a mysterious, immortal man from the 51st century who adopted the identity of a World War II Royal Air Force pilot and ultimately ended up protecting mankind with the help of a secretive alien-hunting team of Earthlings.

CNN: STORY HIGHLIGHTS