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警告!电非常危险!不要触摸插座,不要用任何东西插入插座。插入或抽出插头之前,先关闭插座开关。不要触摸裸露的电线。不要打湿电器设备。电是看不见的,但它无处不在:大自然,我们的家、学校以及工作场所。电已经存在了几十亿年了,但人们能发电、控制电以及使用电的时间只有200多年。现在,我们可以用各种各样的方式发电,利用各种能源发电,例如煤、石油、天然气、风浪、潮汐、太阳光、地热、原子核反应,甚至还能用垃圾发电。
WARNING! Electricity is very dangerous! Do not touch the socket, do not insert anything into the socket. Before inserting or withdrawing the plug, close the socket switch. Do not touch bare wires. Do not wet electrical equipment. Electricity is invisible, but it is everywhere: nature, our home, school, and workplace. Electricity has existed for billions of years, but people can generate, control and use electricity for only 200 years. Now we can generate electricity in a variety of ways, using a variety of energy sources, such as coal, oil, natural gas, wind and waves, tides, sunlight, geothermal, nuclear reactions, and even garbage.