Standing on the top story of Basantapur Palace in Nepal, Yuan Mengxi is having a hard time relating today’s reality with what she saw seven years ago.

The palace complex, 【小题1】 (locate) in the middle of Durbar Square in the country’s capital Kathmandu, was badly damaged in a big earthquake in April 2015. The 9-story palace, 【小题2】 unique tourist attraction, was added to the UNESCO World Heritage List in 1979. The palace not only has great historical 【小题3】 (significant), but is also an architectural feat (功绩).

“You can see the whole place from 【小题4】 I’m standing, and everything is beautiful and in order,” says Yuan, 【小题5】 (original) from Zhengzhou, the capital of Central China’s Henan province and currently works for the Beijing-based Chinese Academy of Cultural Heritage.

She made her first work trip to Kathmandu in October 2015, six months after the earthquake 【小题6】 (shake) the city. 【小题7】 (see) the city after the quake at the time, she says she was in shock. Heritage buildings in Durbar Square 【小题8】 (destroy), with wooden statues buried and spread over a wide area. “Kathmandu Valley was still covered in the dust from the quake,” she recalls. 【小题9】 (aim) to restore the nine-story Basantapur Palace complex, both the Chinese and Nepali governments launched a project in 2017. Now, She is 【小题10】 charge of an exhibition displaying the restoration process of the palace complex.

March 14 is right around the comer, and math learners know 【小题1】 that means. It’s Pi Day, a holiday honoring one of math’s most famous constants (常量): pi.

The number pi, or π, is equal to the circumference (圆周长) of a circle 【小题2】 (divide) by the circle’s diameter (直径). That comes out to about 3.14159. This is true for circles of all sizes, from 【小题3】 (penny) to pizzas to planets. Pi’s value is often rounded to 3.14. That’s why Pi Day 【小题4】 (celebrate) on March 14. It’s also why one Earth-sized planet orbiting another star every 3.14 days is nicknamed “Pi Earth.”

But the exact value of pi is 【小题5】 (actual) impossible to write out. Last year, a 【小题6】 (power) computer calculated pi to record-breaking 62.8 trillion (万亿) figures. And in 2005, one 23-year-old used clever mental tricks to recite nearly 68,000 of those figures from memory. No one, though, will ever get to 【小题7】 end of pi.

Historians aren’t sure when people first 【小题8】 (discover) the concept of pi. But it’s been known in some form 【小题9】 almost 4,000 years. Ancient Greeks and Babylonians knew estimates of it. The Egyptians may have used pi 【小题10】 (build) the pyramids. And still today, pi is used in just about all math involving circles.

Featuring sparkling lakes, spectacular waterfalls, and colorful leaves, Jiuzhaigou National Park in Sichuan Province is a picturesque fairyland. The park’s name, 【小题1】 means “Nine Village Valley,” originated from the nine Tibetan 【小题2】(village) there. It is located in Jiuzhaigou County of the Aba Tibetan and Qiang Autonomous Prefecture in Sichuan Province. It 【小题3】(list) as a UNESCO world heritage site in 1992. The park is also home 【小题4】 3,634 species of plants and animals, including giant pandas and golden snub-nosed monkeys, 【小题5】(win) the good reputation of an “earthly paradise”. The national park covers 【小题6】 area of 720 square kilometers and ranges from 1,996 to 4,764 meters above sea level.

In 2017, a massive 7.0-magnitude earthquake 【小题7】(strike) Jiuzhaigou, and the scenic area was closed due to damage. After continuous reconstruction and natural 【小题8】(recover), the park reopened to visitors in 2021. After the pandemic, the tourist destination has 【小题9】(full) regained its former charm. Tourism facilities have also been improved 【小题10】(provide) better services to tourists.