1) Train cars are separate individuals, and the number of cars can be adjusted.
2) The refill and sleeve of a ballpoint pen are two separable parts, and the refill can be replaced.
3) The three blades of the electric fan are three independent individuals and can be disassembled.
4) For the water supply pipe system in the field, each section is connected by a joint.
5) The chains of bicycles and motorcycles are connected one by one, and each link can be removed.
2 separation
1) In petroleum processing, some oil residues or other harmful substances are refined and separated to obtain high-precision gasoline or diesel oil.
2) After the bullet is fired, the core is separated from the shell.
3) The computer keyboard is separated from the mouse in order to facilitate people to operate well.
4) When the rocket rushes out of the atmosphere, it will disintegrate and separate the part that has burned the fuel.
5) The sound insulation materials used in buildings now absorb or isolate the noise, so that the noise is isolated from our environment.
3 local quality
1) One side of the hammer is made flat, and the other side is made flat, which increases the cutting function of the hammer (special hammer for quarry).
2) mechanical pencil. Make a pair of ears in the center of the pen and add a spring.
3) The drill bit of the electric drill is made into a spiral shape to increase the stability during drilling and prevent slipping.
4) The computer mouse with three-button mode has changed the trouble and inconvenience of the original single button.
5) Changing the opening of the cup and making an incision on it can prevent the leakage when pouring water to the greatest extent (the same is true for the opening of the thermos skin).
4 Asymmetry
1) The zipper on the clothes is pulled at one side and not at the other.
2) blades of electric fans
3) The mobile phone with antenna is asymmetrical.
4) Seen from the side, the broadsword is asymmetrical.
5) The two lenses of glasses have different degrees because of the different myopia of human eyes.
5 merger
1) Combine every car of the train to increase the passenger capacity.
2) The microphone and receiver of the telephone are combined in a box, which is convenient for people to free up one hand to do other things when making a phone call.
3) The troughs for raising livestock on the farm are connected together, which can save feeding time and improve efficiency.
4) Connect indoor equipment in series and use switches.
5) Add a backrest to the stool, and combine them into one to form a chair.
6 Multifunctional
1) The keyboard can be used for typing and playing games.
2) Multifunctional mobile phone
3) Swiss army knife (up to more than 50 functions)
4) mp3 can not only listen to songs, but also store data.
5) The current printer integrates printing and copying.
7 suits
1) Ink, refill and pen cover are set together.
2) TV indoor antenna
3) Umbrella handle
4) The thermos cup and thermos bottle are also made by the principle of suit.
5) Fire engines and cranes
8 quality compensation
The hovercraft is filled with air and floats.
2) Hydraulic jack
3) The submarine uses the discharged water to realize buoyancy.
4) The upward lift of the wind lifts the kite into the air.
5) Filling the balloon with hydrogen (instead of air) can make the balloon float.