Not tired. According to official website of Sun Yat-sen University, the main tasks of exchange students in Jishou University of Sun Yat-sen University are the preparation of work instructions, on-site technical preparation, on-site technical guidance, on-site technical improvement and on-site personnel training. They are not tired and can learn a lot. Exchange students refer to student exchange programs between schools to enhance mutual understanding among young students of different nationalities and countries.