A horse fair is an interesting place. There were young horses from the country, little Welsh ponies and many beautiful horses too. But there were also a lot of poor, thin horses, tired from hard work. I was very sad to see them.

    At the horse fair there was a man with a gentle voice and kind grey eyes. He offered 23 pounds for me, but they refused. Then a man with a very loud voice came. I was afraid he was going to buy me, but he walked off. Then the grey-eyed man came back again and said:

    "I'll give 24 for him."

    "Done," said the salesman. "He's a quality horse and if you want him for cab (出租马车) work, he's a bargain."

Half an hour later we set off for London, along country roads, until we came to that great city. There were streets to the right, and streets to the left. We went into one of the small streets, and then into a very narrow street, with small, old houses.

    My owner stopped at a house. The door opened, and a woman, a little girl and boy, came out.

    "Is he gentle, father?"

    "Yes, Dolly, as gentle as a kitten; you can pat him."

    Dolly, the little girl, patted my shoulder without fear. It felt so good! They led me into a comfortable, clean stable, and after a delicious meal I lay down to sleep, thinking "I'm going to very happy here".

    My new owner's name was Jerry. His wife was called Polly and they had two children, Harry and Dolly. The next morning they came to see me. I loved it when they patted me and spoke in gentle voices.

    "Let's call him 'Jack', after the old horse, shall we, Harry?" said Dolly.

    "Yes, let's," said Harry.

    The first week of my life as Jack, the London cab horse was very hard. The noise and the people and the traffic on the streets scared me. But Jerry was a very good driver, and that helped a lot Jerry soon found that I was ready to work hard and do my best, and he didn't whip (鞭打) me.

    He kept us very clean, and gave us as much food as we wanted. But the best thing was that we had Sundays off.

Dear Aunt Petra,

I'm writing to tell you about the great time we had last weekend. I think mom told you we were going to Manchester on Saturday. Well  , we went to see a football game there, because the team (队) of Manchester United was playing with the team of Liverpool. My father didn't go, because he doesn't like the two teams; he likes Chelsca and Arsenal. I really enjoyed the game but unluckily Liverpool lost the game. The game was 2-0 to Manchester United.

 On Sunday, the weather was not that good, but we still spent the day looking around the city. We got lost because we didn't have a map. It wasn'ta big problem because we asked a policeman for help and he showed us where to go . We visited the Lowry Museum. There are some interesting paintings. And they are from a well- known painter named LS Lowry. There is a picture of one of his paintings in the letter(信) , Hope you like it.

 Yours,

 Jamie

If you've ever used pi in math class, you probably used the number 3.14. In fact, the number for pi is much longer. Pi is called an irrational number (无理数) because the digits (数位) after the decimal point (小数点) never end or repeat.

In 2015, a young man from India named Rajveer Meena set a world record by memorizing 70,000 digits of pi. But pi is much longer than that.

On Pi Day ( March 14th) this year, a company called Solidigm said it calculated (计算) pi to105 trillion (万亿) digits. And the 105 trillionth digit is 6. It broke the record for how many digits of pi we know.

Pi is really useful for circles in math. It helps us connect the circumference with the diameter of a circle.

Even NASA scientists use pi for their work of studying space. But they only need about 15 digits of pi for their calculations.

Calculating pi also has another important use. It's how scientists test new computer programs and data storage systems (数据存储系统).

Solidigm's calculation of pi took around 75 days to finish. The company's owner Brian Beeler said that the achievement needed a lot of work. They had to plan the calculation very carefully.

This isn't the first time that Solidigm has calculated pi. In 2022, Google Cloud calculated 100 trillion digits of pi. Solidigm matched that in 2023.

In the future, we'll keep finding more and more digits of pi. We'll never be able to calculate all the digits of pi because it goes on forever. But it still helps us see how great computers can be.