In life we ​​often cerebral hole wide open

 

I do not know if you have noticed a detail

 

Regardless of the shape

 

Plastic chair in the middle will be a sort of a small aperture opening

 

Do you know what it is you

 

Finally know why the plastic chairs left a hole in the middle of the ......

 

Convenient storage

 

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If you do not open holes

 

It will form a closed space between the upper and lower stools

 

Air pressure results will be very difficult to pull the stool

 

Pile of stool when it is difficult to stack tight

 

Benefits of hole

 

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Finally know why the plastic chairs left a hole in the middle of the ......

 

Easily split when the hole pointed by force

 

And the circular hole easy to do mold

 

Further strength too much effect on the structure of the hole

 

Hole is too small and not conducive to finger Gouqu

 

Know the principle later

 

Let's take a look at the wonderful work of different people give the answer

 

Young artists

 

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Finally know why the plastic chairs left a hole in the middle of the ......

 

Such openings, easy stripping

 

Mold is also cheap, and material saving

 

Ordinary young

 

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Finally know why the plastic chairs left a hole in the middle of the ......

 

After stool pile up

 

Take a rope through the hole you can easily take it