The cellphone window protectingscreen has high impact strength, high scratch resistance and high safety, and the process has low production cost, high production efficiency and high product quality.
Vaccine is a effective method to prevent and cure Helicobacter pylori infection, and it is most important for construction of Helicobacter pylori vaccine to screen out the protecting antigen.
疫苗是预防和控制传染病的有效途径，筛选出幽门螺杆菌保护性抗原是设计和构建幽门螺杆菌疫苗的关键。
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Zinc is a natural insect repellent and sun screen. Protecting lips and skin.