科学的发展推动了技术的进步，科学家的发明与创造推动了人类文明的进程．正是由于奥斯特发现了______，法拉第发现了______现象，才有了今天的电气化时代．
丹麦物理学家奥斯特发现通电导体对周围的磁极有力作用，即电流周围存在磁场，在此基础上，法拉第用十年的时间终于发现了导体在磁场中切割磁感线会产生感应电流，即电磁感应．
故答案为：电流周围存在磁场，电磁感应
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| I've never been late for school, but yesterday I came very close. My alarm clock didn't __1__ and by he time I woke up, my father had already __2__ into the bathroom and had to wait for him __3__. I had to really rush, I took a quick shower, and had some breakfast, and then __4__ to the bus stop. Unfortunately, by the time I got there, the bus had __5__ left. I started walking, but I knew I can't get to school __6__ time. Luckily, my friend Tony and his dad came __7__ in his dad's car and they __8__ me a ride. When I got to school, the final bell __9__. I __10__ made it to my class. | ||||
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