dial down是什么意思？

You can turn the engines off and the actual speed of the carrier will not slow perceptibly for a long time. With the Levi's brand we gradually dialed down our propeller speed and the carrier kept moving. People up on the deck said, `We're still moving fast!' But those down in the engine room said, `Whoa! We're going to be dead in the water!' "
请简练点儿 但不要大概意思
谢谢

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