### Chinese: 兰州交通大学3名学生给校领导写信，反映对大学考试的困惑，并提出提高考试难度，变换考试题型，让考试真正体现学生实际水平的诉求。
### English: Three students from Lanzhou Jiaotong University wrote letters to the school leadership reflecting their confusion about the university exam and proposed improving the difficulty of the exam and changing the types of exam questions so that the exam can truly reflect the actual level of the students.
### Errors: There is no error in the English translation.

### Improved English: Three students in Lanzhou Jiaotong University wrote a letter to leaders of the university to reflect their confusion on examinations in university, and raised the ideas to increase the difficulty of examinations, change types of questions and let the examinations reflect the real learning level of students.
