现在几乎没有人没使用过电池,人们很方便地把电池从口袋里,从书包里拿出来放入随身携带的电器如照相机、录像机、手提电脑之中。电池已经是人们日常生活中不必可少帮手了。但是人们把电装进自己的口袋却花费了很长的时间。 闪电使人类第一次认识了电,也看到了电的威力。从天空劈下来的一道白光可以使山崩石裂,森林起火。 Almost no one has ever used a battery. It is convenient for people to take the battery out of their pockets and take them out into their portable devices such as cameras, video recorders and laptop computers. Batteries are already a necessary helper in people’s daily life. But it took a long time for people to put electricity into their pockets. Lightning made humans first realize electricity and saw the power of electricity. A white light falling from the sky can make the landslide and the forest get angry.