mọi người làm giùm em cái topic 2 người nói ngắn thôi
1 travelling in the future
2 sources of energy
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HD
0
AP
28 tháng 4 2017
1.Sources of energy
Solar power harvests the energy of the sun through using collector panels to create conditions that can then be turned into a kind of power. Large solar panel fields are often used in desert to gather enough power to charge small substations, and many homes use solar systems to provide for hot water, cooling and supplement their electricity. The issue with solar is that while there is plentiful amounts of sun available, only certain geographical ranges of the world get enough of the direct power of the sun for long enough to generate usable power from this source.
HD
1
Q
29 tháng 4 2017
Why we shouldn’t get too excited over the shale boom
Why resource depletion is a greater threat than climate change
Why Fukushima should not be seen as a reason to abandon nuclear
Why the Keystone XL pipeline may do little to help US energy security
Why renewables have difficulty mitigating a liquid fuels shortage
Why we shouldn’t rely on science to solve our energy problems
Forget fusion and thorium breeders – artificial photosynthesis would be a bigger game changer
PP
0
PD
21 tháng 12 2020
2- the differences the life in the past and now
In the past there was no advanced technology. All housework must be done by hand and without assistive devices Most cars are bicycles and motorbikes. Until the recent centuries, new cars gradually became popular. Today the constructions are made mostly by machines without using human power. In the near future, humans are planning robots to completely replace people in labor-intensive jobs such as helping robots, ... The technology is now also much more advanced. Students no longer have to struggle to find a solution to a difficult problem. Technology services to help you learn foreign languages are increasing. But when it grows, environmental pollution and the population of the unemployed are increasing. To overcome the need for improved and more intelligent measures
PD
21 tháng 12 2020
1- tell one of the wonder of Vietnam
This travel guide is for people who want to visit Ha Long Bay, one of the seven natural wonders in the world. Ha Long Bay is located in Quang Ninh province which is in the north of Vietnam. It is nearly 200km from Hanoi. So it takes you about 4 hours by car. You can also travel there in a coach or even in a helicopter on Saturday. The best season to visit Ha Long is in summer when the weather is warm and sunny. Ha Long Bay has many beautiful caves and islands; therefore, you must take a boat trip to enjoy the view here. You certainly must take pictures to remember the trip better, too. If you are an active person, you must do the water sports here like swimming, sailing, and windsurfing. One more thing, you must try the seafood here because it is incredibly fresh and delicious. With this travel guide, I hope that you will have a wonderful time here in the number one natural wonder of Vietnam.
MV
1
AL
1 tháng 5 2021
If the role of the school changes in the future, the relationship between the teacher and the student will change. We see teachers act as instructors rather than knowledge, so when schools change, students can be fully autonomous, self-taught in the way they feel most appropriate. Second, the Internet is everywhere with unbelievably fast speeds. Students will be connected around the world in virtual spaces and anyone can make a request to the global community to help solve a problem. taught from all over the world through hologram and virtual reality glasses, and it is possible that students in each class are segregated according to level and skill level. Due to the abundant number of teachers and not limited teaching space, the classes will have fewer and fewer students, creating an intensive teaching process, the more, the more technology develops, meaning is that the division of class will be more pronounced (even today there is a division of classes). And pens, paper, boards or chalk remained in memory and were completely replaced by electronic touch boards. The lesson will be more vivid thanks to 360 images, virtual reality glasses, and 3-dimensional virtual images. The course materials will therefore be much more vivid. A Spanish teacher can take the class to Mexico City to meet the locals and practice conversations using virtual reality glasses. Geography or Astronomy class, the whole Milky Way will be shown around students thanks to hologram technology. Every student going to school will have a robot accompanying him. Those are the visions of nothing too far-fetched when life is powered by technology.
Traveling in the Future
These days, if you want to travel from New York to Beijing, the flight takes about 16 hours. You also have to wait at the airport, and sometimes you have to transfer onto a different airplane. If you add all of that extra time, the trip takes at least 20 hours. But in the future, the trip from New York to Beijing might only take two hours.
Right now, a private company is developing something called ET3. ET3 stands for “evacuated tube transport technology”. Here is how it works. A tube goes all the way from New York to Beijing. The tube is only a few meters wide. Capsules move through the tube. Six people can sit in one capsule. The capsules use electricity instead of gasoline. For international travel, the capsules can travel at about 6,500 kilometers per hour. That is much faster than airplane - most modern airplanes usually only fly at about 800 kilometers per hour.
So how is this possible? How can these capsules travel so fast? The answer is that there is no air inside the tube. When airplanes fly, they have to move through the air. The air slows the airplanes down. Because there is no air in the ET3 tubes, the capsules are able to move at a very high speed. Besides, the capsules are quite light. They only weigh 183 kilograms.
There are other advantages to ET3. Because it uses electricity, it is quite clean. In addition, it is much quieter than airplanes and cars. Finally, ET3 tubes and capsules don’t require very much building material.
Of course, ET3 doesn’t exist yet. The technology is still being developed. Developers still have to solve a lot of problems. The biggest problem is that right now, ET3 would be far too expensive. In order to make ET3 cheaper, we will need much better technology.
It is exciting to think of how ET3 will change travel in the future. Maybe someday, you will be able to have lunch in New York and dinner in Beijing.