The service stations and servicemen of fuel gas appliances must pass the examination of the MFGMO before they are permitted to engage in service work.是什么意思_The service stations and servicemen of fuel gas appliances must pass the examination of the MFGMO before they are permitted to engage in service work.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句