I was born in Thailand, where I feel at home. I am used to jumping on to a song taow (red taxi), and squeezing (挤过) in between two strangers. I am used to bargaining at the market to get a shirt that I like. I love telling bilingual (双语的) jokes and I am used to the surprised looks I get from the Thais when I can speak their language fluently.

    Every two years my family goes to America for the summer, and every two years my world is turned upside down. The prices of everything are three times what they were in Thailand, but there is the sweet drink Dr. Pepper! And Bluebell Ice-cream! And everything you could imagine! I am amazed at it all, but the biggest change for me is the people. There are white people everywhere. I am not tall but average (中等的), my yellow hair is no longer out of place, and speaking English no longer draws looks. I should feel comfortable. I'm not out of place anymore, and nobody is looking at me, but I feel like they are. Now I feel out of place and different. I'm not used to giving people handshakes and hugs when I meet them for the first time. I get looks when I have trouble figuring out how much money to pay. I know different music, different places, and different fashion. I can't understand these people who have never left their town or city.

    Still, there are quite a few perks about living overseas. I get to meet people from all over the world, and I know how to adjust to (适应) different cultures and places. I have been to places most people see only in geography books. Still, being so different makes it hard to know who you are. I'm not Thai, but I am not American either. I am a mix of both cultures, a third culture kid.

    Recently, people in US education have gotten extremely worried because a new report has shown that American students have a math problem.

    The 2015 Program for International Student Assessment(评估)(PISA) shows math scores in the US getting lower and no improvement in science or reading. PISA tests 15-year-olds from different countries and regions in their math, science and reading skills. About 540, 000 students from 72 countries and regions took part in the assessment in 2015.

    US scores in reading and science were about the same as three years ago, leaving Americans near the middle of the bigger group. But the situation in math is much more worrying. The US average score was 470, below the OECD(经合组织)test average of 490, meaning the US was No. 40 among the 72 countries and areas. It was 12 points lower than in 2012 and 18 points lower than in 2009. So, what is going on with American students' math skills?

    One reason may be that the US does not teach math in enough depth. "Students are often good at answering the first part of a problem in the United States, "said Andreas Schleicher, director of education and skills at OECD. "But as soon as students have to go deeper and answer the more complicated part of a problem, they have difficulties. "In comparison, many high-performing countries and regions in math teach a lot less but focus in much greater depth,  especially when you look at East Asia, Japan and Singapore, according to Schleicher.

    Another reason may be the fact that many people in the US are unwilling to travel to foreign countries to learn better teaching practices. "One of our biggest challenges in the US is that the teachers are not going out and seeing what high-performing countries do differently, "said Wendy Kopp, who started Teach for America, in a news program.

    After the examination, the doctor told my parents my sight would get worse and that I would lose my sight finally. On the way home from hospital, no one said a word. One day, would I only imagine the scenery beyond the glass rather than see it?

    That September, I entered middle school. Most nights I had homework that included an armful of books to read. To keep up with other children, I took great trouble to finish the task. With my nose a couple of inches from the page, I was tired easily. What's worse, after I had read several pages on my own, the words slipped off the page into inky pools.

    However, then I did not have audio books and electronic devices like kids do now. Instead, Mom volunteered to read out loud. Mom worked part time, cleaned the house, cooked and spent time with Grandma. In spite of being so busy, she showed up in my room like clockwork. She put on her reading glasses. Mom always thought those glasses made her look old. To me, she looked like a teacher.

    In my room, Mom's voice compared with the ticking of the clock. Being forced to focus on listening, I found a way to keep my marks up and compete with the other kids. When the teacher asked a question, I raised my hand with confidence. Teachers praised me for having a good memory. Reading removed my fear for my failing sight, reading also made me curious about other people's challenges and how they managed. Though I could not use my eyes to fix on each passage, my mind lit up with every new book.

    True to what the doctor said, the worst came, but thanks to Mom, my sense of hearing now allows me to “see”. This was the most precious gift from a mother to her child.

    The big fire in April that tore through the Notre Dame Cathedral in Paris(巴黎圣母院) is still fresh in people's minds. The 800-year-old landmark suffered great damage to its top, but thankfully the most valuable religious relics and cultural treasures were undamaged.

    So a US publishing company GoArchitect organized the People's Design Competition to invite designers, worldwide to share their ideas of rebuilding the French landmark. The open call attracted more than 200 proposals from 56 countries and regions. In the end, Chinese architects Cai Zeyu and Li Sibei won the competition with their striking design. They are both the post-90s generation.

    Named "Paris Heartbeat", the design replaces the old top with a kaleidoscope(万花筒) of multifaceted mirrors, which is combined with a mirror roof, reflecting the ever–changing urban environment.

    The kaleidoscope is the floating "time capsule", at the top using magnetic levitation(磁悬浮) technology, which is meant to open every half century. The "time capsule" moves up and down, breathing and beating together with the city.

    "I believe that the 'time capsule' can be achieved with present technology," Cai told the Global Times.

    The pair hoped that their design, Paris Heartbeat, could meet people's high expectations for the rebuilding. As Cai and Li told GoArchitect, "Notre Dame witnessed Parisian history. It burns, survives and co-breathes with the ever-changing world…The 2019 fire will mark a new era."

    Though people still don't know what kind of design the French government will choose, it's clear that people around the world hope that the lost beauty of Notre Dame will come back. Once rebuilt, it will certainly become a permanent part of history and the Parisian skyline again.

    Taking your pulse during physical activity allows you to measure how hard you are exercising. You should exercise to stay within your target heart range.

    Increasing your heart rate is a key part of exercise but it is important that your heart rate is not too high or too low. If you are a beginner, you should also be able to breathe comfortably while exercising. This will ensure that you are exercising at a level that is safe and effective for your body.

    The chart below illustrates target heart rate ranges for exercise based on the maximal heart rate for selected ages. Here are the steps for using the chart:

Delicate, shining, and soft to the touch. The fabric called silk {#blank#}1{#/blank#} (find) its way into the heart of Chinese people in the past thousands of years.  {#blank#}2{#/blank#} origin of it is not clear, but the ancient Chinese people {#blank#}3{#/blank#} (credit) their own wisdom to Leizu, wife of the Yellow Emperor, as the inventor of sericulture (养蚕业).

The style and texture (质地) of silk are {#blank#}4{#/blank#}(variety). Hangluo satin from Hangzhou,Zhejiang province, is famous for its airy and thin texture, {#blank#}5{#/blank#} Yunjin brocade from Nanjing, Jiangsu province, a luxurious fabric often {#blank#}6{#/blank#} (use) for royal clothes, represents China's silk weaving (纺织) technique at its best time. Yunjin brocade is best made  {#blank#}7{#/blank#} hand, in a complex procedure that comprises more than a hundred steps. Even the most skilled artisans can only weave a few centimeters a day.

In the Western Han Dynasty (206 BC—AD 24), with Zhang Qian{#blank#}8{#/blank#} (open) up the routes to the western regions, silk graced countries in Central Asia, and later other parts of Eurasia and beyond.  {#blank#}9{#/blank#} (appropriate), its name marked China's major international trade {#blank#}10{#/blank#} (route), the ancient Silk Road and Maritime Silk Road.

As one of the wonders of ancient China, silk is not merely a type of fabric but a cultural symbol and a representative of elegance.