sub系列前缀，是根据词根第1个字母而变换的，俗称变色龙。
su + 的这个字母，和词根的首字母一致，发音才比较顺畅。
那么，怎样才把这10个前缀拿下不遗漏？

我尝试把最后一个字母，变成了一句顺口溜。
你在地铁（sub词根总称）下面，搜索sou.su一下，肥f妹m是s不b吃c鸽g子屁p股肉r的。
sou.su.suf.sum.sus.sub.suc.sug.sup.sur，10个，通通拿下！
让我死记硬背，哀家做不到啊！

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