求翻译：（4）按有易燃麻醉气体与空气混合气和氧或氧化亚氮混合气情况下使用时的安全程度分，属于不能在有易燃麻醉气体与空气混合气和氧或或氧化亚氮混合气情况下使用的设备。是什么意思？

(4) a flammable anesthetic gas and air mixture and the mixture of oxygen or nitrous oxide level of security points, are not flammable anesthetic gas and air mixture and oxygen or nitrous oxide mixed equipment used in the case of gas.

(4) the presence of a flammable anaesthetic mixture with air mixture with oxygen or nitrous oxide gas mixture, use the security level, which is not in the presence of a flammable anaesthetic mixture with air mixture and oxygen or nitrous oxide gas mixture used.

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(4) according to flammable anesthetic gas mixture with air or nitrous oxide and oxygen mixture using the security level, belongs to cannot have flammable anesthetic gases mixed with air or gas and oxygen or nitrous oxide mixture, the device is used.

(4) presses has the flammable anaesthesia gas and the air mixture air and the oxygen or in the nitrous oxide mixture air situation uses when the safety rate minute, belongs cannot in have the equipment which the flammable anaesthesia gas and the air mixture air and the oxygen either or in the nitrou