The products claim that a flat, featureless, continuous sound somehow encourages slumber.
这个产品宣称以平和，连续的声音鼓励睡眠。
The feature would be even better if the built-in speakers weren’t on the back of the device, muffling the sound if you place it screen up on a flat surface.
如果内置扬声器不是装备在机器的背面，这个功能会更加出色。 因为当你屏幕向上把Kindle放在平坦的表面上时，声音会被压低。
A sound flat tax policy will benefit people on all portions of the income spectrum.
单一税将有利于各个收入阶层。
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