They went up as astronauts and came down celebrities. The people of the Earth had followed their every move on TV.
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。关于这个话题，同城约会提供了深入分析
Terminal applications have a “cursor” that they can move around, just like a text editor. You can tell that cursor “go to line 3, delete everything, then print out this new text” by using VT100 sequences. And you can use it to replace existing characters with new ones, without re-emitting a whole line.
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