"密封保存" 用英语可以说为 "sealed preservation"。
"密封" 的英文是 "sealed"，它来自拉丁语 "sigillum"，意思是"印章"。"保存" 的英文是 "preservation"，它来自拉丁语 "praeservare"，意思是 "保护"。
例句:
These fruits have been sealed for preservation. (这些水果已经密封保存。)
The artifacts were sealed in airtight containers for preservation. (文物已经密封在密封容器中进行保存。)
Proper sealed preservation can extend the shelf pfe of food. (适当的密封保存可以延长食品的保质期。)