Gravity

Gravity is the force that cause an object with mass can pull everything around it. In the 17th centery, scientist Isaac Newton understand it by watching a falling apple. This force affects everything and every where. For example, the gravity of the sun causes the motion of the solar system. Gravity lets us stand or fall. Without gravity, we will fly straight to space and planets and stars will move in lines. For sure we can say gravity is the foremost force in our lives.

Gravity

Gravity is the force that cause an object with mass pulls everything around it. In 17 centry, scientist Isaac Newton found it by the falling of an apple. This force affects everything and everywhere. For example, the gravity of sun causes the motion of the solar system. We can stand or fall is also an effect of the gravity. Without gravity, we will fly straight to the space and planets, stars will move in lines. For sure we can say gravity is the foremost force in our lives.

How to Make Friends

Everyone needs other people's help, so making friends is a important lesson for us to learn. First, pick a person you like. Then introduce yourself to him or her. This step needs perfect communicating ability. If you succeed, try to be concerned about friends. Keeping concerned about friends is important because it helps to hold the friendship together. Don't forget to talk to your friend. With conversation, you can know what your friend is thinking. Soon, you will be each other's best friend. Making friends will be much easy if you try it.

How to Make Friends

Friendship is a kind of relationship between two people are good to each other, so making friends is a important lesson for us to learn. First, pick a person you like. Then, introduce yourself to him or her. This step needs a perfect communicating ability. If you succeed, try to concern your friends. Keeping concerning of friends is important because it helps to hold the friendship. Don't forget to talk to your friend. By a conversation, you can know what's your friend thought. Soon, you will be each other's best friend. Making friend will be much easy if you try it.

Airplane

Airplanes arehigh-speed trasportation. They are very popular now. First, they can travel in long distance. The advanced airplanes, can fly cross the Pacific without stopping. Second, they can carry a lot of weight. Passengers and baggages are able to be together in an airplane. Third, the speed of modern airplanes is incredible. The fastest airplane can fly as more than 3000 k.p.h. By these benifits, airplanes become the best choice for travellers.

Car Engine

A car is a combination of all kinds of tehcnologies, and the heart of it, the engine, is certainly the most complex part. It works in a cycle of four steps. First, the engine let some air go into the cylinder. Then the piston squeezes the air and the gas together. This step makes burning easier and faster. Next, the engine make a little flame and the mixture of gas and air suddenly explode. The explosion pushes the piston go up and down. This action provides the energy for the car to run. Last, the engine releases the air out to prepare for the new cycle. In my opinion, the engine is always the most amazing and complicated machine in the world.

Car Engine

A car is the combination of all kinds of technologies, and the heart of it, the engine, is certainly the most complex part. It works in four circulative steps. First, the engine inhales some air into the cylinder. Then, the piston squeezes the air and the gas together. This step makes burning easier and faster. Next, the engine light a fire. The mixture of gas and air suddenly explode. The explosion push the piston to spin. The spinning of the piston provides the energy for car to run. Last, the engine releases the air out to prepare for the new circulation. In my oponion, the engine is always the most amazing and complicated mechine in the world.