一次语文课上,老师向同学们解释“惊慌失措”、“不知所云”、“如释重负”、“一如既往”四个成语。恰巧,某学生正在呼呼大睡。老师一拍桌子,该生顿时坐了起来,拿起书便看,老师说:“这便是惊慌失措。”接着,老师让他回答问题,他站起来支吾了半天。这时老师说:“这便是不知所云 In a Chinese class, the teacher explained to the classmates four idioms: “panicked”, “unknown”, “relieved” and “always”. By the way, a student is asleep. When the teacher landed on the table, the student suddenly sat up and picked up the book, and the teacher said, “This is a panic.” Then the teacher asked him to answer the question and he stood up for a long time. At this time the teacher said: "This is unintelligible