if cabin pressure builds up beyond normal maximum due to system malfunction or inadvertent operation of the manual system, these relief valves open to relieve excess positive pressure to ambient.
如果由于系统失效或偶然地操作了人工系统,而使积累的座舱压力超过了正常的最大允许压力,则这些释压活门打开,将过多的正压力释放到大气中。