Since the environmental noise level is the key index for evaluating the availability of frequency channels, it is very important to accurately measure the environmental noise.

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。

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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。

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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.

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。当确定了什么是有帮助的，什么是有妨碍的后，增加有帮助的部分，排除其他部分。

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