今天的市场上有许许多多称之为“数学经济模式”的东西，但没有一个是提供封闭式的有唯一解的系统。
There are a lot of so-called "Mathematical Economic Models" in today's market, but none of them presents an inclusive and deterministic system.
分离的相对较少量的油污物质残留在封闭式油箱内，可以采取合法的最经济方式进行处理。
This leaves a relatively small amount of concentrated waste trapped in an encased cartridge to be disposed of by the most economic of legitimate means.
造成这种局面的主要原因，在于体制不合理，行业政策失误和封闭式计划经济的束缚。
Such a situation is mainly caused by irrationalism in managerial structure, misguided industrial policies, and constraints enforced by self-contained planned economy.
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