确保在改变载荷过程中发动机没有不正常噪音，在控制抗阻箱中无反常热量产生。
There is no unusual noise in motor during the progress of changing over the load and on abnormal heat generating in control resistance box.
适当水平的背景噪音可能会打断我们正常的思维模式，足以让我们发散想象力，而不会让我们无法集中注意力。
The right level of background noise may interrupt our normal patterns of thinking just enough to allow our imaginations to wander, without making it impossible to focus.
因为正常健康睡眠的关键是大脑要能够阻止对噪音做出回应。
Because the key part of normal healthy sleep is being able to block the response to sounds.
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