根据算符优先分析法，给定某文法和符号串。构造算符优先关系表，若算符优先关系表满足算符优先文法，则对给定的输入符号串进行归约分析，可以判定该符号串是否是给文法的句子。 -According to operator priority analysis, given a string of grammar and symbols. Tectonic relationship between the operator priority table, if the operator precedenc