外部经济是产业水平上的规模经济，是单个生产主体降低成本、提高效率的重要渠道。
External economy is a kind of industrial - level scale economy, which is an important way for a single producer to low his costs and to improve his efficiency.
降低单个机器零件的生产成本是我们实现降低整体生产成本这一更大目标的唯一途径。
Reducing the production costs of individual machine parts is the only way to achieve our larger goal of reducing our overall production costs.
蒸汽动力不仅可以用于纺织棉花和轧铁；新世纪早期，蒸汽机的使用同样大大提高了造纸的效率，蒸汽动力一天所生产的纸张总量是单个工人一天生产纸张总量的10倍。
Steam power did not merely spin cotton and roll iron; early in the new century, it also multiplied ten times over the amount of paper that a single worker could produce in a day.
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