Why is the lid called smart lid

When I first heard about "Smart Guy", I was really surprised. How did such a "smart" name come from? I searched the Internet for a long time, but I couldn't find the reason for the name. But by observing the water dispenser in the office, we can also see some details. I think this smart guy is really "smart". So why is the lid called the smart lid?

Where can POF shrink film be used

The manufacturer of pof heat shrinkable film adopts the principle of high orientation molecular chain stretching and orientation design, and is formed by the method of quenching and setting. Products with regular and irregular shapes can be packed.