Tip: Plaster is a kind of external traditional Chinese medicine, which was called thin plaster in ancient times. It is a gelatinous substance boiled with vegetable oil or animal oil, which can be coated on one side of cloth, paper or skin for a long time. Mainly used for treating sores and swelling pain. As early as a long time ago, China medical scientists said, "Plasters can cure diseases, and there is no special decoction. If used properly, it will make a sound. "

Mystery: building a triangle with four corners, not copper, but iron. Answer: gypsum riddle: take four corners, not triangles, and stick to the advantages and disadvantages. Answer: gypsum riddle: round, flat and square, not a jar or a jar. Men and women are close because of injury. Answer: Plaster riddle: This thing is black and white, round and flat, and it has been everywhere, but it has never been to a good place. The answer is: plaster.