Have you ever been to a sporting event and seen a "noisemeter" appear on the big screen?
你曾经去过一次体育盛会，看到一个“噪音计”出现在大屏幕上？
2
Choose a stone homework workers 60 people as control group: use noisemeter measuring work environment noise and dust sampler determination of dust concentration.
选择非石雕功课工人60人作为对照组：运用噪声仪测定工作情况噪声以及粉尘采样器测定粉尘浓度状况。
3
You find that with any existing simple "noise-meter", vehicles which are judged to be equally noisy may show considerable difference on the meter.