没有什么固定公式；有人在黎明时分状态最佳，有人则在夜深人静时灵感最盛。
And as for their noise-cancelling features, Mangino says "The ANC on this pair of headphones is just right, too. It isn't the best I've ever experienced, which isn't entirely surprising since the ear cups aren't particularly snug; that's great for comfort, but less effective for passive noise cancellation. But I find that its ANC easily blocks out the noise of busy city streets and the clink and clatter of my local coffee shop."
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The Department for Environment, Food and Rural Affairs said: "Our chalk streams are one of Britain's most nature rich habitats and are embedded in our plans to reform the water industry.