It was the day of the big cross-country run. Students from seven different primary schools in and around the small town were warming up and walking the route(路线)through thick evergreen forest.

I looked around and finally spotted David, who was standing by himself off to the side by a fence. He was small for ten years old. His usual big toothy smile was absent today. I walked over and asked him why he wasn’t with the other children. He hesitated and then said he had decided not to run.

What was wrong? He had worked so hard for this event!

I quickly searched the crowd for the school’s coach and asked him what had happened. “I was afraid that kids from other schools would laugh at him,” he explained uncomfortably. “I gave him the choice to run or not, and let him decide.”

I bit back my frustration(懊恼). I knew the coach meant well—he thought he was doing the right thing. After making sure that David could run if he wanted, I turned to find him coming towards me, his small body rocking from side to side as he swung his feet forward.

David had a brain disease which prevented him from walking or running like other children, but at school his classmates thought of him as a regular kid. He always participated to the best of his ability in whatever they were doing. That was why none of the children thought it unusual that David had decided to join the cross-country team. It just took him longer—that’s all. David had not missed a single practice, and although he always finished his run long after the other children, he did always finish. As a special education teacher at the school, I was familiar with the challenges David faced and was proud of his strong determination.

May 21st this year marks the first International Tea Day, which was named officially     1     the United Nations on November 27th, 2019. To celebrate     2     festival, a number of events took place at the Chinese Businessman Museum in Beijing on Thursday.

The chairman of the China Culture Promotion Society     3     (address) the opening ceremony. “As a main promoter of the International Tea Day, the birthplace of tea and the     4     (large) tea-producing country, China has a     5     (responsible)to work with other countries to promote the healthy development of the tea industry. It can help to build a community with a     6     (share) future for mankind,” he said.

The “First International Tea Day Tea Road Cooperative Initiative” issued (发布) at the ceremony calls for people working in the tea industry to come together to promote international cooperation     7     cultural exchanges. A four-year tea promotion —Tea Road Cooperative Plan — was also issued in accordance with the initiative.

    8     (strengthen)the connection with young people, the event included a number of public promotional activities on social media,     9     (invite) twenty-nine tea professionals from around the world to have thirty-six hours of uninterrupted live broadcasts.

The Chinese Ancient Tea Museum was officially unveiled (揭幕) at the ceremony, opening     10     (it)first exhibition: The Avenue of Truth — A Special Exhibition of Pu’er Tea.

6 . Can a small group of drones (无人机) guarantee the safety and reliability of railways and, at the same time, help railway operators save billions of euros each year? That is the very likely future of applying today’s “eyes in the sky” technology to make sure that the millions of kilometres of rail tracks and infrastructure (基础设施) worldwide are safe for trains on a 24/7 basis.

Drones are already being used to examine high-tension electrical lines. They could do precisely the same thing to inspect railway lines and other vital aspects of rail infrastructure such as the correct position of railway tracks and switching points. The more regularly they can be inspected, the more railway safety, reliability and on-time performance will be improved. Costs would be cut and operations would be more efficient (高效) across the board.

That includes huge savings in maintenance costs and better protection of railway personnel safety. It is calculated that European railways alone spend approximately 20 billion euros a year on maintenance, including sending maintenance staff, often at night, to inspect and repair the rail infrastructure. That can be dangerous work that could be avoided with drones assisting the crews’ efforts.

By using the latest technologies, drones could also start providing higher-value services for railways, detecting faults in the rail or switches, before they can cause any safety problems. To perform these tasks, drones for rail don’t need to be flying overhead. Engineers are now working on a new concept: the rail drones of the future. They will be moving on the track ahead of the train, and programmed to run autonomously. Very small drones with advanced sensors and AI and travelling ahead of the train could guide it like a co-pilot. With their ability to see ahead, they could signal any problem, so that fast-moving trains would be able to react in time.

8 . Sometime in the early 1960s, a significant thing happened in Sydney, Australia. The city discovered its harbor. Then, one after another, Sydney discovered lots of things that were just sort of there — broad parks, superb beaches, and a culturally diverse population. But it is the harbor that makes the city.

Andrew Reynolds, a cheerful fellow in his early 30s, pilots Sydney ferryboats for a living. I spent the whole morning shuttling back and forth across the harbor. After our third run Andrew shut down the engine, and we went our separate ways — he for a lunch break, I to explore the city.

“I’ll miss these old boats,” he said as we parted.

“How do you mean?” I asked.

“Oh, they’re replacing them with catamarans. Catamarans are faster, but they’re not so elegant, and they’re not fun to pilot. But that’s progress, I guess.”

Everywhere in Sydney these days, change and progress are the watchwords (口号), and traditions are increasingly rare. Shirley Fitzgerald, the city’s official historian, told me that in its rush to modernity in the 1970s, Sydney swept aside much of its past, including many of its finest buildings. “Sydney is confused about itself,” she said. “We can’t seem to make up our minds whether we want a modern city or a traditional one. It’s a conflict that we aren’t getting any better at resolving (解决).”

On the other hand, being young and old at the same time has its attractions. I considered this when I met a thoughtful young businessman named Anthony. “Many people say that we lack culture in this country,” he told me. “What people forget is that the Italians, when they came to Australia, brought 2000 years of their culture, the Greeks some 3000 years, and the Chinese more still. We’ve got a foundation built on ancient cultures but with a drive and dynamism of a young country. It’s a pretty hard combination to beat.”

He is right, but I can’t help wishing they would keep those old ferries.