在这项基础工作中，地球的曲率和重力场都应被考虑。
In this fundamental work, curvature and the gravity field of the earth must be considered.
计算结果表明：水滴受到重力和电场力的作用被拉长而曲率半径变小，最大场强值变大。
The calculation results show that the maximum of electric field intensity in- creases when raindrops'radii is becoming smaller because of lengthening.
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