seal energized by medium pressure

例句：

1. 1. Theseal on the envelope is broken.
   信封上的封印被破坏了。
2. 2. The seal of the governmentwas removed by a revolution.
   政府印章被革命者移除了。
3. 3. The seal of thedocument is authenticated by a notarypublic.
   该文件的印章由公证人进行认证。