preventive use预防性使用preventiveadj.预防的；防病的n.预防物；预防性措施preventive-separated measure预防隔离措施preventive drug of cold injury寒冷损伤预防药preventive effect of expansion防膨效果preventive medicine detachment预防医学分队preventive maintenance support预防性维修保障preventive sanitary inspection预防性卫生监督preventive maintenance program预防性保养计划preventive maintanance measure预防性保养检测preventive maintenance service预防性维修服务preventive treatment of disease治未病

1. Cultivation technology and prevention of Gynura, as well as cure method of disease and pest control are summarized in this paper.
   摘要简述了紫背天葵的栽培技术及病虫害防治方法。
2. The preventing methods and the reasons of the pickled cabbage as chippings packed in plastic bags to turn brown and mildew was introduced in the store.
   介绍了袋装酸菜末在贮藏过程中褐变和霉变的原因及防治方法。