常見例句雙語例句Read the postfix expression from left to right.從左到右讀入後綴表達式If you could not pop two operators, the syntax of the postfix expression was not correct.如果您不能夠彈出兩個操作數(shù)，後綴表達式的語法就不正確。If the postfix expression was correctly formed, the stack should be empty.若後綴表達式格式正確，那麼堆棧應該爲空。 返回 postfix