The tests measured range of hearing over low, mid and high noise frequencies.
这些测试测量了对低、中、高频率噪声的听觉范围。
2
Examples range from contamination of the food or water supply, to high levels of air or noise pollution, a chemical accident, a disease outbreak or a natural disaster.
这方面例子的范围包括从食物或水供应的污染，到空气或噪音高度污染、化学事故、疾病暴发或自然灾害。
3
And for your large tests, practice filtering and changing your time range to see if you can remove some of the noise from your results.