There are no hard and fast rules about the use of hyphens in English.
对于连字符号的, 英语没有严格的限制。
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So in that sense, historically, the German letter that's written kind of like the letter B (the Eszett) does historically come from a ligature of the long S and the letter Z even though it is pronounced as a double S today.
因此从这个意义上说,从历史上看,写法有点像母 B(Eszett)的德语母在历史上确实来自长 S 和母 Z 的连,尽管今天它的发音是双 S。