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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None of these is guaranteed to work, but together they represent a significant step toward fundamental cost control.

这些都不保证起效，但他们代表朝着根本性成本控制的重要一步。

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But the near-perfect spectacle came at a cost: control that squeezed any spontaneity out of the events.

但是这种几近完美的表象是有代价的：那就是将一切自发的言行排除于奥运之外的控制。

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Still, what makes this a better cost control than what existed before is that these recommendations automatically become law unless Congress can pass a different plan that achieves the same savings.

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Backed by the corporate bureaucracy, a chief executive might once have got by with good managers, cost-control, and a beady eye on the accounts.

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But with cost control, a strong balance sheet and loads of stock buybacks, Gap has made itself an attractive investment.

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