1, chocolate, native to Central and South America, its ancestor is "xocolatl", which means "bitter water". Its main raw material, cocoa beans, is produced in the narrow strip within the equator latitude 18.
2. The main ingredient of chocolate is cocoa liquid, which contains theobromine, which is toxic to many animals. However, for humans, theobromine is a healthy anti-sedative ingredient, so eating chocolate can enhance the spirit and enhance the excitement.