This paper reviews the structure, source, biological function of cecropins and their application in plants and animals, and discuses their existing problems and perspectives.

本文综述了天蚕素抗菌肽的结构、来源、生物作用，重点介绍了天蚕素抗菌肽的应用，并对其存在的问题和未来发展前景进行分析。

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Each mapping expresses the rule of creation of target structure from the source structure.

每一个映射表达了数据源结构的目标结构的建立规则。

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At a high level, metadata refers to information about data, such as its definition, structure, source, etc.

从高层面上说，元数据指关于数据的信息，比如数据的定义、结构、来源等等。

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"It's correlating the increasing intensity in different bands that provides really important clues about the structure of the source, " Prof Madejski - a co-investigator on the NuStar X-ray telescope, told BBC News.

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This decentralised structure may be a source of weakness as banks merge and become more pan-European.

ECONOMIST: Banking on a crisis?

As ETFs have exploded in popularity, they also have become the source of concern that the structure distorts prices or would break under the strain of investors bailing out en masse.

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