Experimental results and theoretical work show that the mechanisms of the direct charging and the corona charging are respectively the tip effect and collision effect.

由试验结果和理论分析得到直接荷电法的机理是尖端效应，电晕荷电法的机理为碰撞荷电。

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Dr. Marion Moses, director of the Pesticide Education Center in San Francisco, California, notes that at least one commonly used class of pesticides, organophosphates, can adversely affect the heart -- and this effect is just the tip of the iceberg.

CNN: Children face danger in the schoolyard grass from pesticides