同学，老师，各位早上好。 我准备演讲的主题是取材自书里的第三单元“ac

Students, teachers, good morning. <br>I prepare the speech's theme is taken from the book's third section "achievements", I am going to talk about is the greatest invention of mankind. <br>In fact, it is widely believed that the greatest invention is not the only, I am no exception. Who can say with lamp world is not new in the world? Who can say that the invention of the computer does not open a new era? It is undeniable lamps, computers, antibiotics, and even watch with my hands, and they are a great invention. <br>But today I want to particularly say this achievement is a bicycle. First bike was a Frenchman named Sivrac in the eighteenth century invention, when the bike is like this, there are around two wooden wheels, the middle of a crossbar, the top is a bench. Now we look this incredible invention, it can be seen that there is no chain of transmission, can only rely on people riding bicycles feet firmly placed to advance slowly, the car did not turn means people can only be to get off turn. Nevertheless, I still think it's the world's greatest inventions. I think the emergence of a bicycle, marks the human from having to walk upright, and it gave people a lot of inspiration from mechanical principles and maneuverability above, in the follow-up to help people upgrade and transformation of cars. In addition, the bicycle is the most efficient human-vehicle output. <br>The invention relates to a bicycle fact there are many stories, I'm not here to repeat them in detail. I'm as human beings in the 21st century, long lamented the invention when cyclists ride very happy, it is too great. <br>These are all my statement. Thank you for listening.

Good morning, classmate, teacher.<br> The theme of my presentation is "achievements" from the third module of my book, and the topic of my speech is the greatest invention of mankind.<br> In fact, it is generally accepted that this greatest invention is not unique, and I am no exception. Who dares say that the world with electric lights is not a new world? Who can say that the invention of computers did not usher in a new era? There is no denying that electric lights, computers, antibiotics, and even watches i have on my hands are all great inventions.<br> But this achievement I have to say in particular today is cycling. The original bike was invented by a Frenchman named Sivrac at the end of the 18th century, when it was like this, with two wooden wheels in front and back, a crosswood in the middle and a bench at the top. Now we look like this invention is incredible, you can see that it has no transmission chain, can only rely on the cyclist's feet to ride the bike slowly, the car also has no steering device, people can only get out of the car to make a turn. But even so, I still think it's the greatest invention in the world. What I'm thinking about is the advent of bicycles, a sign that humans never have to walk upright, and that it has given people a lot of inspiration from mechanical principles and maneuverability, helping people to upgrade and remodel cars in the future. In addition, bicycles are the most efficient vehicle for human output.<br> There are many stories about the invention of bicycles, which I won't go into detail here. As a human man in the 21st century, I lamented the invention when I was having a good time riding a bike.<br> These are all my statements. Thank you for listening.

Students, teachers, good morning.<br>The theme of my speech is from the third unit "achievements" in the book. The topic of my speech is the greatest invention of mankind.<br>In fact, it is generally believed that this greatest invention is not the only one, and I am no exception. Who can say that the world with electric lights is not a new world? Who can say that the invention of computer has not ushered in a new era? There's no denying that lights, computers, antibiotics, even the watches I have on my hands are great inventions.<br>But the achievement that I want to say in particular today is cycling. The original bicycle was invented by a French man named Sivrac at the end of the 18th century. At that time, the bicycle looked like this. There were two wooden wheels at the front and back, a crossbar in the middle and a bench at the top. Now we can see that the invention is simply incredible. We can see that it has no transmission chain, and can only slowly move forward by pedaling on the bicycle with both feet of the cyclist. There is no steering device on the bicycle, and people can only get off the car to turn. But still, I think it's the greatest invention in the world. What I think about is the emergence of bicycle, which marks that human beings do not have to walk upright from now on, and it gives people a lot of inspiration from the mechanical principle and maneuverability, which helps people upgrade and transform cars in the future. In addition, bicycles are also the most efficient means of transportation with human output.<br>There are many stories about the invention of bicycle. I won't go into details here. As a human being in the 21st century, when I was very happy to ride a bicycle for a long time, I exclaimed that this invention was really great.<br>That's all I have to say. Thank you for listening.<br>