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。

youdao

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。

youdao

On a steep site, with waterway views to the southeast, and an ongoing subdivision to the north, the Bach elongates against the contour to generate flat ground and a view to the Sound.

小屋建在陡峭的场地上，通过水道将视线引向东南方向，一直延伸到北部的小块地，小屋顺着地平面向外延伸，产生朝向峡湾的视野。

youdao

In two seconds flat there was the sound of a person thundering up the stairs and knocking at the door.

CNN: ASIANOW - TIME Asia | Walkabout: Bad & Bitter

If you're listening closely, you'll notice that songs streamed over Bluetooth sound a bit flat and soft around the edges.

WSJ: Bluetooth Speakers: The Untethered Sound System

The flat voice acting aside, sound design is also fine, with some nice touches like the occasional burst of birdsong.

FORBES: Review - Carrier Command: Gaea Mission