On Saturday, I and mom go shopping together, pass a canal, 3 workers crouch beside the sewer that do not have a lid, I follow them enthusiasticly to greet sb, among them a young uncle asks me: Do you know “ why is well lid round? ”“ hum, so simple, not be round well lid can walk back and forth. ” my great replies. “ answer is not complete, should say so, because wait for round radius and diameter equal, how to walk to won't drop. Uncle ” laughs. One's voice in speech just fell, another uncle begins to ask me the question: “ why is the tire of the car a circle? Uncle ” points to on the side the car in the past. “ because wheel embryo is a circle, the circle has scroll sex. Answer of ” my apace came out. The 3rd uncle ask a question: Where should “ that axle install? I meet ” partly temporarily answer not to come out, ask the mathematical talent —— on the side mother. Mom tells me: “ axle should assemble the center in the wheel. ” I nod, feel mom says very reasonably. The 2nd uncle is ill-affected, ask me again: “ why the center that axle wants to hold a wheel? ” my after-thought has the result of the first problem: Because “ waits for round radius and diameter equal, such ability hold the smooth position of the car. That uncle begins ” admire me, vertical stroke had thumb.
星期六，我和妈妈一起去逛街，通过一条小道，三个工人蹲在无盖下水道旁，我热情的跟他们打招呼，其中有一位年轻的叔叔问我：“你知道井盖为什么是圆的吗？”“哼，这么简单，不就是圆井盖可以转来转去。”我得意地回答。“回答不完整，应该这样说，因为等圆的半径和直径都相等，怎样踩都不会掉下去。”叔叔笑了笑。话音刚落，又一位叔叔开始问我问题了：“为什么车的轮胎是圆的？”叔叔指了指旁边过去的汽车。“因为车轮胎是圆的，圆具有滚动性。”我快速地回答出来了。第三个叔叔又发问了：“那车轴应该装到哪里？”我一时半会答不出来，就问了问旁边的数学天才——妈妈。妈妈告诉我：“车轴应该装在车轮的中心。”我点了点头，觉得妈妈说得很有道理。第二位叔叔不服气，又问我：“为什么车轴要装到车轮的中心？”我回想起第一个问题的答案：“因为等圆的半径和直径都相等，这样才能保持车的平稳状态。”那个叔叔都开始佩服我了，竖起了大拇指。
We arrived again in a village, the worker that sees flower bed of a clip into the village sits woebegonely by of lawn of a rectangle. I ardently and that worker lets sb know, he spoke he himself woebegone account, it is the lawn that center of canal of village other people explains him to want the lawn this rectangle to cut a circle so, the requirement cuts the area below to be achieved as far as possible least. The length that my composition wants a worker to take out tape measure to measure a lawn and wide, measuring the length that come out is 15 meters, wide it is 7 meters. Worker master worker asks me how to be cut give this circle, I remember the area ” of the “ circle that learns in the school, listed on the ground “7 calculating type divides the stone that picks up a ground to go up immediately to multiply 3·14” with the square of 2. Worker master worker asks again: “ how many meters should this round radius be? ”“7 is divided with 2 be equal to 3·5, radius should be 3, 5 meters. ”“ this circle is too big, how should be I cut? ” worker master worker is very interrogative. “ you tape measure dish put the center with wide lawn, play tape again 3, 5 Mi Yuan, bind clip long knife to the top of tape measure, you take tape measure dish that, I am taking long knife to circle circuit round you, help you be on lawn engrave a mark, redundant yourself is cut off, so simple. I say ” cock-a-hoop. I prepare to leave, but he called me again: “ has a problem to was not solved then, content runs a center even I install to rotate automatically in center of clip good lawn sprinkling irrigation device, how many meters should the length of that eject be? Can by the area of sprinkling irrigation how much be? The length of ”“ eject is 3, 5 meters, the area of sprinkling irrigation is 38, 465 square metre. ” says me to go to village recreation center again.
我们又到了一个小区里，一进小区就看到一个修剪花坛的工人愁眉苦脸的坐在一个长方形草坪的旁边。我又热心地和那位工人打招呼，他说出了他自己愁眉苦脸的原因，原来是小区物管中心交待他要把这个长方形的草坪剪成圆的草坪，要求剪下的面积尽量达到最少。我作文要工人拿出皮尺量出草坪的长和宽，量出来的长是15米，宽是7米。工人师傅问我怎样剪出这个圆，我想起在学校里学的“圆的面积”，立马拾起地上的石头在地上列出算式“7除以2的平方乘3·14”。工人师傅又问：“那这个圆的半径应该是多少米？”“7除以2等于3·5，半径应该是3、5米。”“这圆太大了，我该怎样剪呢？”工人师傅很疑惑。“你把皮尺盘放到草坪宽的中心，再把皮尺拉到3、5米远，把修剪长刀绑到皮尺的顶端，你走到皮尺盘那头，我拿着长刀围着你绕一圈，帮你在草坪上刻上一个印子，多余的你自己剪掉，就这么简单了。”我得意洋洋的说。我准备离开，但是他又叫住了我：“那有一个问题没有解决，物管中心还要我在修剪好草坪中心安装一个自动旋转喷灌装置，那喷射的长度应该是多少米？能被喷灌的面积又是多少？”“喷射的长度是3、5米，喷灌的面积是38、465平方米。”说完我又去小区娱乐中心了。
There are a lot of uncle aunts over people, have some of aunt among them people turning circle of part of speech, I and a young and beautiful aunt made call, she asked me a question: “ why is circle of part of speech a circle? I answer ” : “ does not have edges and corners because of circle of part of speech, won't prick the person's body, so simple. Those ” aunts people be profuse in praise.
在那里有许多叔叔阿姨们，其中有些阿姨们正在转呼啦圈，我和一位年轻漂亮的阿姨打了招呼，她问了我一个问题：“为什么呼啦圈是圆的？”我回答：“因为呼啦圈没有棱角，不会刺到人的肉体，就这么简单。”那些阿姨们都赞不绝口。
This day, I discovered to have in the life lots and lots of “ round ” .
这一天，我发现了生活中有许许多多的“圆”。