如图是元素周期表中钠元素的有关信息，回答下列问题：

My aunt bought me a bicycle on my ninth birthday. She told me to learn to ride by 1. But I really didn’t know 2to ride a bike. What should I do? First, I watched the other people ride. Then I pushed out the bicycle from my house. I was 3 I’d fall down and hurt my knees. But I knew I had to get on it sooner or later. So I4 to get on just like what the other people did. But I fell off twenty 5 later. Just at that time, my aunt came out from the 6. She told me to practice again and again. So I got on the bike a second time, and fell off a 7 time. But I never gave up. I practiced a third time, a fourth time …. I could be on it 8 every time I tried again then before, 5 minutes, ten minutes, half an hour… until I could.
Like anything in life that you want to learn how to do or to be good at, you have to practice to 9 it happen. Diligent practice is the key to success10 you really want to learn to do a thing. More practice helps you to improve on the skills that you learn and ingrains （使根深蒂固）them in you until you can do it.  
 

用自己的话总结《邹忌讽齐王纳谏》第一段的内容，并说说他的作用。