To say that burgers must be round, sandwiches are made of bread, with vegetables cut in geometry. When I opened my brain hole to work on whether to be round or square, I suddenly remembered that I went to Shanghai a few years ago to eat a long burger with a length of almost 40 centimetres each, and later learned that it was a sandwich, which was named a submarine sandwich because it was like a submarine. I've had it once, because it's delicious. There are a lot of different kinds of sandwich that you like to add. I remember the last time I ate the sour cucumber, and the waiter asked me if I needed it, and I like to add a couple of pieces, and the other burgers were almost there. This sandwich is nothing like a hamburger, but different shapes. So I still call it a hamburger。