The seat rows only backscatter frequencies above a certain threshold, though, so they act, in effect, as a soundfilter.
每排座椅只反射高于一定频率的声音，因此实际上它们充当的是声音过滤器。
2
Researchers took 12 fish tanks, and killed the gurgling filtersound to mimic the quiet of a calm lake.
研究人员找来12个大鱼缸，想办法消掉过滤器的潺潺声，以模拟安静的湖水环境。
3
This may sound confusing, but in practice you don't really need to worry about the details; the important thing is that this ACTS to filter out unnecessary information.