This is probably a common question over the Internet, but I couldn't find an answer that neatly explains how you can convert a byte array to a hexadecimal string, and vice versa.

这可能是在互联网上常见的问题，但我无法找到巧妙地解释了如何将字节数组转换为十六进制的字符串，反之亦然答案。

youdao

Now do that in a sound byte on a national radio station when you got two minutes to answer.

这时你就得为全国听众一字一句地,在两分钟时间内解答这个问题

耶鲁公开课 - 美国内战与重建课程节选