被动的植物自我防御包括物理和化学防护，这些防护保护它们使病原体无法进入，像细菌，或者对侵略者放出一系列的不好闻的气味或是有毒的物质。
Passive plant defense comprises physical and chemical barriers that prevent entry of pathogens, such as bacteria, or render tissues unpalatable or toxic to the invader.
电焊专业人员进入作业现场，作业人员一定要穿戴好防护用品并应戴好防护镜或防护面罩。
When entry in the site, the worker should wear the protection goods, the welder should wear the protective.
第二，急救者要对自己的救助能力和防护能力进行评估，不具备救助能力和防护能力者应等待增援，不能贸然进入现场，否则可能付出惨重代价；
Secondly, those who want to do first-aid must assess the lifesaving and defense capabilities of themselves, does not rashly to enter the scene, otherwise it might pay a heavy price;
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