Like RDBMS indexes, you can create compound indexes using multiple attributes, and unique indexes, which ensure that duplicate values are not allowed.
与RDBMS索引相似，可以使用多个属性创建复合索引，也可创建唯一索引，确保不存在重复的值。
But a patent on a molecule-such as a compound that treats a disease in a unique way-creates a period of protection during which no one else can sell the molecule for that particular purpose.
但是一个在分子方面的专利——比如一种能治病的独特的化合物——很长一段时间别人都不可能生产出类似的产品来。
Scanning for compound documents, incrementing the revision number, and applying unique document Numbers all increase response times and affect scalability.
扫描复合文档、递增修订号和应用惟一的文档号都会增加响应时间和影响可伸缩性。
And this is originated from its peculiar natural environment, unique location, sound military and political center, compound composition of culture as well as various patterns of different schools.
这是和巴渝大地奇特的自然环境、独具的区位优势、稳固的军政中心、复合的文化组成、多样的办学模式分不开的。
Architecture should act as a compound receptor that can physically assures the unique life of each individual, and should not be a concentration camp for isolated individuals of community life.
建筑应该作为一个复合受体，既可以在生理上满足每个个体独特的生活需要，但是又不能使个体间像社区生活那样被孤立开来。
Polymer Matrix Composites Made of Wastes (PMCMW) is the important component of compound material, and its unique part is that more than 95% of its raw material is wastes .
聚合物基废弃物复合材料（PMCMW）是复合材料的重要组成部分，它的独特之处在于它的原材料95％以上采用废弃物复合而成。
Main compositions: Spring water extract, Protein compound, Sweet tea extract, Hydration Collagen, Unique factor, Rose extract.
主要成份：温泉水精华、蛋白复合物、甜茶萃取液、水合胶原蛋白、特制因子、玫瑰精华。
In the study, the researchers used the unique assembly strategy to create a novel compound to combat metastatic breast cancer.
在这项研究中，研究者们通过使用一种独特的装配方法产生一个新奇的复合物来抑制乳腺癌的转移。
This paper establishes the concept of maximal common factor and minimal common multiple for compound function and proves their unique existence.
证明了等价关系族构成的有界格，建立了函数复合的最大公因式、最小公倍式等概念，并对其存在唯一性作出证明。
Legal English is an English variation. It has very obvious stylistic and linguistic features. The main linguistic features lie in the unique lexis, compound syntax and stylized discourse.
法律英语是英语的变体，具有鲜明的文体特征和语言特征。其语言特征主要体现在独特的词汇、复杂的句式和程序化的篇章等方面。
The unique morphology and chemistry of medium thermal can be translated into excellent rubber compound properties.
中粒子热裂炭黑的独特形态组成和化学性质可使腔料璺现极好的性能 。
The results indicated that, due to the unique structure characteristics and mixing mechanism, the performance of its mixed compound has significantly improved than other rotors.
结果表明，六棱vcmt同步转子因其独特的结构特征、混炼机理，其混炼胶的性能较其他转子有着明显的提高。
Designed as a general purpose compound, ITL's unique blend of synthetic and natural rubber provides cost effective operations on gas and electric trucks in most industrial applications.
为通用作业环境而设计，ITL采用独特的合成胶和天然胶并用配合体系，可以为大多数行业的燃气车、燃油车和电瓶车提供高性价比的轮胎。
Designed as a general purpose compound, ITL's unique blend of synthetic and natural rubber provides cost effective operations on gas and electric trucks in most industrial applications.
为通用作业环境而设计，ITL采用独特的合成胶和天然胶并用配合体系，可以为大多数行业的燃气车、燃油车和电瓶车提供高性价比的轮胎。
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