The periodic system provides better control over inventories than a perpetual system.

与永续盘存相比较，定期盘存提供更好的存货控制。

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The advantage of biological control in contrast to other methods is that it provides a relatively low-cost, perpetual control system with a minimum of detrimental side-effects.

与其他方法相比，生物防治的优点是它提供了一种成本相对较低、有害副作用最小的永久性防治系统。

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That means perpetual debt for as long as the system exists.

那意味着只要系统存在，就有永恒的债务。

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Before 1995, Chicago teachers went on strike nine times in two decades, leaving the system in perpetual disarray.

ECONOMIST: Chicago��s schools: Drawn upwards | The

In Ireland's political system, with its perpetual coalitions, that could mean that Sinn Fein holds the balance of power.

ECONOMIST: North meets South

Since all forms of fractional-reserve lending are dependent on the perpetual creation of more and more credit that the system eventually can no longer sustain, it eventually collapses under its own weight.

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