说明：  防火墙的局限性和脆弱性及密罐技术的研究 防火墙的局限性和脆弱性及密罐技术的研究防火墙的局限性和脆弱性及密罐技术的研究
(firewall limitations and vulnerabilities of tanks and close firewall technology of the limitations and vulnerabilities of tanks and secret technology Research firewall limitations and vulnerabilities secret cans and technical research)