To lower the risk of Covid-19 contagion, NTHU will increase the number of online learning courses from May 12 to Jun 8. All courses with more than 100 students are recommended to use the remote learning mode (either synchronous or nonsynchronous). For those courses that cannot implement the remote learning mode, such as laboratory, operational, or sport courses, the instructors are advised to keep the classroom ventilated and seats 1.5 meters apart.