Dear students, I will be offline for the next few days due to a personal illness. I apologize for any inconvenience this may cause. If you have any urgent questions or concerns, please contact at weichen@hotmail.com. I will be back online as soon as possible and will respond to all of your messages then. Thank you for your understanding. Sincerely, Wei Chen
All of the time slots displayed in the time zone Asia/Shanghai GMT +08:00