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This topic reminds me of the unforgettable pandemic occured a few years ago. At the very beginning, most people around the world stayed home for many weeks.Then I read some news about the change of our enviroments. One said that he could see the Everest from hundreds of miles aways from his hometown. The sky became clearer than usual that seemed has just been washed. So, from that news, I knew that the human activities was the main reason caused the environmental pollution. 200 years ago, people's trip rreally depended on riding horse and walking. The farthest places a average person could get to throughout their life might be many miles aways from their hometown. So, they affected the invironment very finitely. But everything changed after the Industrial Revolution, especially since cars were invented. So if we can abandon cars and get back to the simple life hundreds of years ago, maybe enviromental problems won't exist again. Can we?
22 de jul. de 2025 8:59
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A Day Without Friction I woke up first thing in the morning, my eyes opening groggily. When I tried to get out of bed, I immediately stumbled and fell. It was so odd—why was the floor… so slippery? I slid helplessly across the room until I slammed into the wall. Pain shot through me! Carefully, I pulled myself upright and tried walking again, only to slip and fall once more. Without friction, the floor was impossible to walk on! It was clear I was in serious trouble before my day had even started. How can you begin a day when you can’t even stand? A world without friction was terrifying. Tentatively, I attempted to stand up, but instantly lost my balance. I slid wildly across the living room, finally using the far wall to stop myself. It felt exactly like being adrift in space like in movies. This experience made me realize how perfect and holistic our world is with friction, gravity, and all the other forces that keep us grounded. The world we have now is definitely best.
22 de jul. de 2025 8:39
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This is the second time of talking about this interesting topic this month, because my electric car gave me a suprise yesterday. I had a short trip by driving my car yeasterday. The place we visited only has one road to get which meandera in a montain. I thought that it will be a challenge for an electric car, but as a consequence, we got the destination very easily. When I check the dash board, it showed that it just spent 1.0 litre gas per 100 kilometres (actually my car is a hybird car). It was a big suprise! When my car went downslope, it would be charged by the gravity, when it went a upslope, the electricity would powered my car. The computer systerm in my car is really good at using any power both from gas and nature. You know that when you step the brake pedal in a moving gas powered car, the extra energy from burning gas will be spread into air , even causes air pollution. But for a hybird car, the energy will be collected and stored in the battery. The efficiency of using the extra energy for a hybird car can be around 40%, But for a gas powered car, all the extra energy wastes.So, who is better?
21 de jul. de 2025 9:44
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