[Expert # 不 Suggests Organizing Mountain Climbing and Park Collective Activities #] Feng Luzhao, a researcher at the Chinese Center for Disease Control and Prevention, said that during the epidemic prevention and control period, it is not recommended that units and enterprises organize collective activities such as mountain climbing and park tours. High-risk areas continue to be strictly controlled, and it is not recommended to visit parks and mountains; medium-risk areas do not travel in peaks, do not gather together and chat, it is recommended to wear masks, do not spit, and disinfect in time after returning home. In low-risk areas, you can visit the park alone to climb the mountain. When the density of people is low, you do not need to wear a mask. When there are many people, you must wear a mask. In addition, pay attention to increase and decrease of clothing to prevent cold.