避雷针
6.Abstract: Based on the field measured lightning parameters it is concluded that lightning rods can not provide enough corona to avoid a lightning stroke.Therefore，it is unreasonable to explain the mechanism of lightning rods with the principle of neutralizing effect.
7.Inspired by these ideas, in 1752 Franklin developed a practical lightning rod.
8.If lightning strikes something, such as a house or a tree, it usually causes great damage unless they are fitted with lightning-rods.
9.A directional radio and television antenna consisting of a horizontal conductor with several insulated dipoles parallel to and in the plane of the conductor.
10.And he is the lightning rod for criticism of the Bush administration by scientists who allege that political appointees are stacking science advisory committees to hew a conservative line on issues such as sexual practices and AIDS.
