[In earliest times], men considered lightning to be one of the great mysteries of nature. Some ancient peoples believed | that lightning and thunder were the weapons of the gods.
[In reality], lightning is a flow of electricity formed high above the earth. A single flash of lightning (1.6 kilometres long) has enough electricity to light one million light bulbs.
The American scientist and statesman, <Benjamin Franklin>, was the first to show the connection between electricity and lightning in 1752. [In the same year] he also built the first lightning rod. This device protects buildings from being damaged by lightning.
Modern science has discovered | that one stroke of lightning has a voltage of [more than] 15 million volts. A flash of lightning between a cloud and the earth may be [as long as] 13 kilometers, and travel at a speed of 30 million meters per second.
Scientists judge | that there are about 2,000 million flashes of lightning per year. Lightning hits the Empire State Building in New York City [30 to 48 times] [a year]. [In the United States (alone)] it kills an average of one person [every day].
The safest place to be in case of an electrical storm is in a closed car. [Outside], one should go to low ground and not get under trees. [Also], one should stay out of water and away from metal fences. [Inside a house], people should avoid open doorways and windows and not touch wires or metal things.
[With lightning], it is better to be safe than sorry?
in reality 实际上, 事实上
Benjamin Franklin 本杰明·富兰克林
lightning rod 1) 避雷针 2) 引火烧身的人（或事）
protect...from... 保护...免受...(破坏/攻击/伤害), 保护...以免...
more than 超过, 不只
as long as 长达...
Empire State Building 帝国大厦
New York 纽约
the United States 美国
in case of... 假使, 万一
electrical storm 电暴；雷暴
go to... 去...
out of 1) 从...出来 2) 离开（某处），不在内; 在外 3) 缺乏（某物）; 无
away from... 离...(一段距离)