[yù fáng]
prevent; take precautions against; guard against
									
										carry out the policy of putting prevention first in medical work
										贯彻以预防为主的医疗方针
									
									
									
										take special precautions
										采取特殊的预防措施
									
									
									
										prevent a disease from spreading
										预防疾病蔓延
									
									
									
										Europeans take melons for a preventive against seasickness.
										欧洲人吃瓜作为预防晕船的方法。