我这有正解，“s”是最多的无疑，其次是“p"(事实证明），然后分别是“c","a","m","t","b","u","d","r","h","e"准确无误（答案中包含专业词汇、生僻词、衍生词）
是S，其次是A
s 对了 你可以查看下牛津字典就知道答案了
s c
