他建议用计算机模拟各经济体，而非利用经济学家的推演能力，手动制造模型。
Instead of solving models "by hand", using economists' powers of deduction, he proposes simulating economies on the computer.
要想用一个经济模型来计算，那这个模型就必须要有具体的以代数形式给出的表达式。
But to compute an economic model, this theory has to be given concrete form, spelt out in definite algebraic terms.
一个再好的拖拉机经济寿命计算模型，如果没有真实、可靠的数据，也是枉然。
A good calculating model of tractor economical life is no use, if there is no real, reliable data.
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