本文介绍了通过建立数学模型、并采用CAD技术直接计算并生成避雷针保护范围，可以避免计算差错并明显的提高设计效率。
This paper will introduce how to build the mathematical models, and calculate the protection range of the lightning rods via CAD technology.
富兰克林是美国的国父，远近双对焦眼镜和避雷针的发明者，小学辍学生——虽然听起来有些不可思议，但这正是富兰克林的准确生平介绍。
A founding father, the inventor of bifocals and the lightning rod and elementary-school dropout-it sounds crazy, but this is an accurate description of Franklin.
富兰克林是美国的国父，远近双对焦眼镜和避雷针的发明者，小学辍学生——虽然听起来有些不可思议，但这正是富兰克林的准确生平介绍。
A founding father, the inventor of bifocals and the lightning rod and elementary-school dropout-it sounds crazy, but this is an accurate description of Franklin.
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