Since no approximation is made in the derivation of the time-delay optimal controller from the mode-controlled equation, the system stability is easy to guarantee.

因在由控制模态方程推导时滞最优控制律的过程中无近似处理，所给控制方法易于保证控制系统的稳定性。

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When the first crop of John's beloved hillside vineyard ripened in 1978, they couldn't find a picking crew and the grapes hung for three or four days beyond what they judged to be optimal ripeness a delay that would eventually prove to be a blessing, though they didn't know it at the time.

WSJ: The Near-Accidental Brilliance of Shafer Vineyards

If you are in a dedicated home theater this can be less important, but since many living rooms prevent optimal speaker placement, having the ability to adjust the level of a speaker or add a delay to simulate distance can be critical.

ENGADGET: How to actually use Dolby TrueHD and DTS-HD HD