I read a book to cry today " the maths in the story " , I listen curious, did not think of to there also is maths in the story. With respect to an old practice that for instance I like most, he is the time with the earth, latitude is concerned, but interesting, I will tell you to listen.
今天我读了一本书叫《故事中的数学》，我一听就好奇了，没想到故事中也有数学。就比如我最喜欢的一个故事，他是和地球的时间，纬度有关，可有意思了，我来讲给你们听吧。
The story wants as a child lark and foolish the book that boy reads begins. Small lark looks foolish boy loves to look so " 80 days of annulus swim the earth " , studied issue of a his travel. Small lark asks again, if a person winds earthly a week along north latitude 60° , a few days can come back, foolish boy head is not moved blurt out, 80 days! Small lark says that but wrong, every place differs 15° , differ one hour. Foolish fellow says: On the earth, always write a composition longitude differs two places of 15° , be about to differ one hour on time, in fact, 180° of the east longitude and west longitude 180° are coincide, what confluent Yu Taiping silvers coin is mid, then astronomer and geographical home decided date of a “ changes line ” , always nautical person, if from east the word of westerly, the course must jump over a day when this line; If be from go to on the west east, be about to calculate a day twice. They thought of from here " 80 days of annulus swim the earth " the “ flaw ” in, if he is from east westerly goes, so he should be to use 81 days, from go to on the west east should use 79 days.
故事要从小百灵和傻小子读的书开始。小百灵看傻小子那么爱看《80天环游地球》，就考了他一道行程问题。小百灵又问，如果一个人沿着北纬60°绕地球一周，几天可以回来，傻小子脑袋都不动一下脱口而出，80天！小百灵说那可就错了，每个地方相差15°，就相差一小时。傻小子说：在地球上，凡是作文经度相差15°的两个地方，在时间上就要相差一小时，事实上，东经180°和西经180°是重合的，汇合于太平洋的中部，于是天文学家和地理学家商定了一条“日期变更线”，凡是航海的人，如果从东往西的话，经过这条线时就必须跳过一天；如果是从西往东，就要把一天计算两次。他们从这里想到了《80天环游地球》里的“漏洞”，如果他是从东往西走的，那么他应该是用了81天，从西往东就应该用了79天。
So, on maths, also matter certainly stick actual, cannot think all the time with mathematical thought.
所以，在数学上，也一定要紧贴实际，不可以数学的思想一直想。(文/咸宇豪)