方法根据数据类型和分布特征采用相应的统计描述与推断方法，运用差距分析法进行安全性评价，并结合定性访谈结果进一步分析产生差距的原因。
Methods a descriptive statistical methods was employed. A qualitative method, such as key informant interview was also used to evaluate the causes of the disparities.
从微观机制上分析推断：外加电场使非稳态等离子体中的电子作定向运动，加剧电子与原子之间的碰撞是上述结果的主要原因。
The collision between atoms and electrons moving in a definite direction with the additional static electric field is considered to be the primary reason for the result mentioned above.
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