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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，这一点在Line官方版本下载中也有详细论述
text += dec.decode();
Most modern ATMs follow this same model, although the actual protocol has，这一点在搜狗输入法下载中也有详细论述