Since the environmentalnoiselevel is the key index for evaluating the availability of frequency channels, it is very important to accurately measure the environmentalnoise.
环境噪声电平是评价频率通道能否可用的关键指标，因而正确测量环境噪声具有十分重要的意义。
2
Environmental issues such as noise and level of alertness may interfere with learning new behaviors.
环境问题诸如噪音和警戒的水平也许会妨碍新行为的学习。
3
Environmental issues such as noise and level of alertness may interfere with learning new behaviors. After identifying what helps and what hinders, increase the helpers and eliminate the rest.