1. corrosion and its prevention 
   腐蚀和防腐
2. pitting and crevice corrosion 
   点腐蚀和缝隙腐蚀
3. A bacterial enzyme; bacterial diseases. 
   细菌酶；细菌性疾病
4. A gelatinous material derived from certain marine algae. It is used as a base for bacterial culture media and as a stabilizer and thickener in many food products. 
   琼脂从某种海藻中提取的明胶酶物质，它可用作菌类培养基及食品加工中的稳定剂和凝胶剂
5. This metal resists corrosion. 
   这种金属抗腐蚀。

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