The main fields of current research on XML safety issues are XML Encryption, XML Digital Signature and XML Access Control.

目前XML安全问题研究的主要领域有：XML加密、XML数字签名和XML访问控制。

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Multi-Modality fusion is one of the hottest discussed issues in the current research of medical image processing and it has a deep impact on the cognitive science and clinical treatment.

作为当今医学影像技术研究中的热点问题之一，多模态医学影像融合技术的研究及其研究成果，对认知科学的研究和临床治疗有着重要的意义。

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This paper mainly focuses on the recent progress in the research methods and strategies of tooth regeneration. Several key issues in current tooth engineering are also mentioned and discussed.

本文就牙齿再生的研究手段、研究策略等方面的最新进展进行综述，并对牙齿组织工程研究当前所面临的主要问题展开讨论。

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