This paper introduces the welding principle, design idea and key techniques of a miniature sealedsource welding machine, which will realize fully automatic welding of miniature sealed sources.
文章介绍了微型密封源焊接机的焊接原理、设计思路及其关键技术，实现了微型密封源的全自动化焊接。
2
But while batteries store all the chemicals needed for the necessary chemical reactions in a sealed package, fuel cells use an external fuel source and air from the atmosphere.
电池是在密封容器存贮化学反应必需的化学品，但燃料电池却使用外部燃料和大气。
3
Opening sealed subsurface drain line manways to attempt to localize the source of tritium into the system.