求翻译：人孔是安装在储罐顶上的安全应急通气装置，通常与防火器、机械呼吸阀配套使用，既能避免因意外原因造成罐内急剧超压或真空时，损坏储罐而发生事故，又有起到安全阻火作用，是保护储罐的安全装置，特别适用于贮存物料以氮气封顶的拱顶常压罐。具有定压排放、定压吸入、开闭灵活、安全阻火、结构紧凑、密封性能好、安全可靠等优点。是什么意思？

Manholes are installed on top of the tank safety emergency ventilation devices , usually associated with fire , mechanical breathing valve supporting the use , both to avoid accidental causes sharp when overpressure or vacuum tank , tank damage and accidents , and

One hole that is installed in the tank on top of the Security Emergency Ventilation unit, usually with a firewall server, mechanical breathing valve with both to avoid the cause of the accident resulting in the tank rapidly over-pressure or vacuum, damage to the accumulator tank and have an accident

The human hole is installs on the Chu tank deck the security emergency breather, usually with fire protection, mechanical respiration valve necessary use, when both can avoid the accidental reason creates in the pot the sudden overpressure or the vacuum, damages the storage tank to have the accident

People hole is installation in storage tank top of security emergency ventilation device, usually and fire device, and mechanical breathing valve supporting using, both can avoid due to accident causes caused tank within sharply Super pressure or vacuum Shi, damaged storage tank and occurred acciden

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