这句话怎么翻译?关于pressure envelope? 提供一个参考: as a safety measure, the oxygen inside the system pressure envelope should be reduced below the flammability limit prior to introduction of the process hydrocarbons. 作为一项安全措施, 在碳氢化合物引入系统压力密封仓以前,内部的氧气含量应降到燃点以下。 [ ]查看更多