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。
No giant sucking sound, just the gentle hissing of an inner tube losing air, threatening a flat tire that could send the American dream machine off the road.
即便听不到较大的泄气声，只是嘶嘶地缓慢漏气，也会使名为“美国梦”的这台汽车的轮胎瘪掉，而偏离了正确的道路。
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