...dictionary)，数据修改以前的映象(before-images of modif IEd Data)索引(indexes)和其他类型的结构(other types of structures)。一个数据库中至少包含一个数据文件。
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Besides occupying 3-dimensional space, their "atomic structures" — that is, the individual components or parts of these types of systems — are constructed from other physical entities.
除了占据三维空间，它们的“原子结构”(即组成这些系统的单个成分或部分)都来源于其他的物理实体。
Any given volume of water contains two types of molecular structures-one a blobby, loosely packed agglomeration and the other a tight, regular arrangement resembling a crystal lattice.
任何给定容量的水包含两种类型的分子结构—一种是点点松散的凝聚体，而另外一种是紧凑规则的类似晶体的组合。
Basically there are just four types of structures that can be used to bridge a stream or other obstacle: rigid beams, cantilevers, arches, and suspension systems.
基本上仅有四种结构能够用作在水流或障碍物上架桥：钢梁、悬臂结构、拱结构和悬索体系。
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