摘要近年来，复杂网络已经成为众多学科共同关注的一个研究热点。
Abstract in recent years, complex network has become a hot research topic in many disciplines.
近年来，信息隐藏成为研究的一个热点问题。
In the recent years, the research of hiding information has become a hot issue.
近年来技术溢出效应的研究已成为高技术产业研究的一个热点课题。
In recent years, technology spillover effect of high-tech industry has become a hot research topic.
近年来，对IKE协议的分析和改进已成为网络安全领域的一个研究热点。
Recently, analysis and improvement of IKE protocol has become a hotspot in network security area.
近年来，对IKE协议的分析和改进已成为网络安全领域的一个研究热点。
Recently, analysis and improvement of IKE protocol has become a hotspot in network security area.
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