Because a logical or physical model is an abstraction of the real-world system, it is usually very complicated, and it consists of many building blocks and relationships.
由于逻辑或物理模型是现实中的系统的抽象，它通常非常复杂，由很多构建块和关系组成。
The facility is also a world-scale chemical plant, pumping out thousands of tons of polyethylene and polypropylene, the building blocks of plastic, and paraxylene, which gets turned into polyester.
这家工厂也是一座世界级规模的化工厂，将源源不断地生产成千上万吨聚乙烯、聚丙烯（塑料的基本组成部分）和二甲苯（PX，用于合成聚脂纤维）。
These five elements act as the building blocks from which our material world and bodies are built.
这五种元素是构筑物质世界和身体的基础个体。
Recently, the term of "ontology" has been up taken by researchers in Artificial Intelligence, who use it to designate the building blocks out of which models of the world are made.
最近，本体在人工智能领域中得以应用，它被认为是构建世界模型的积木。
Recently, the term of "ontology" has been up taken by researchers in Artificial Intelligence, who use it to designate the building blocks out of which models of the world are made.
最近，本体在人工智能领域中得以应用，它被认为是构建世界模型的积木。
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