星期天带儿子上街玩,路边小摊上卖的风车吸引了他的视线。其实那种风车构造很简单:一根竹棍,竹棍顶端横着一根细铁丝.以铁丝为轴两端各有一个纸风轮。令儿子感到惊奇和不解的是:两个风轮虽平行放置,却向不同的方向旋转。当儿子问我为什么时.我没有直接告诉他,而是佯装不知地说:“我也不太清楚,我们还是买个风车看看吧。”风车一拿到手,儿子便急不可待地开始研究:嗯,两个风轮大小一样,中轴一样,都有八个风叶……看来看去也看不出所以然来。儿子丧气地说:“什么鬼玩意儿,不看了。”见他要放弃,我赶紧提醒他:看看两个风轮的风叶有什么不同。哇,这回发现了,原来两个风轮的风叶是向不同 Sunday took her son to the streets to play, and the windmills sold at the street stall attracted him. In fact, the kind of windmill structure is very simple: a bamboo stick, bamboo stick at the top of a fine horizontal wire to the ends of the wire shaft with a paper wind wheel. To his son was surprised and puzzled is: Although the two wind wheels placed parallel, but in different directions rotation. When the son asked me why, I did not tell him directly, but pretended not to say: “I’m not too sure, we still buy a windmill look at it.” The windmills get their hand, the son will be anxious to start research : Well, the size of the two wind wheels the same, the same axis, there are eight blades ... ... it seems that it can not see why it. Son said angrily: “What a ghost thing, do not read.” See him to give up, I quickly reminded him: look at the two Fengyun Feng Ye what is the difference. Wow, this time found that the original two wind wheel blades are different