How Does a Rocket works火箭是如何運作的？

Have you noticed what happens if you let theair out of a balloon？ The air goes one way and theballoon moves in the other way. Rockets work inmuch the same way. Waste1 air comes out of therocket at high speed2 and pushes the rocket forward.

Most modern launchers3， such as Europe’sAriane 5， are made up of a great number of parts.They are very heavy. Most things in the rockets arefuel4. Rockets need so much fuel to get over Earth’sgravity5. Only when they reach a speed of 28，000km/h are they traveling fast enough to get into orbit6.

Most rockets are made up of two or three stages7.When a stage has used up all of its fuel， it breaksaway. It then falls back （usually into the ocean and farfrom people） or burns up in the air.

Large launchers often get another boost8 fromrockets of the first stage. These may use solid9 orliquid10 fuel. They， too， are usually thrown awayafter use.

你有沒有注意到，如果把氣球里的空氣放出來會發(fā)生什么呢？空氣朝一個方向流出，而氣球會朝另一個方向移動。（剩余491字）