We have not quite figured out our acoustic insulation.

因为我们还没有解决隔音的问题。

To create a virtually silent ride, Rolls-Royce adds approximately 300 pounds of acoustic insulation around the cabin.

为创造一个没有噪音的出行，莱斯莱斯在轿厢周围增加了差不多300磅重的隔音材料。