元胞自动机是模拟复杂社会经济系统的有效工具。
Cellular Automata (ca) is an effective tool used to simulate complicated social and economical system.
统计作为一种科学原理和技术，对社会经济起着举足轻重的工具性作用。
As a scientific theory and technology, statistics is extremely important for the society and economics.
担保物权制度既是保障市场交易安全的基本手段，也是社会经济的有效调节工具。
The legal institute of real security is not only a means of transaction safety insurance, but also an effective mediator of social economy.
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