To enrich a system you need variance in time and space.
系统要变得丰富，就需要时间和空间上的不同步变化。
The variability in demand increases as the average and the variance of lead time increase.
随著平均前置时间与前置时间变异性的增加。
The variability in demand increases as the average and the variance of lead time increase.
随著平均前置时间与前置时间变异性的增加。
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