When tea and coffee were first introduced to Europe in the 18th century, people had different ideas about their use.Some said that tea and coffee were harmful to humans and they could cause (引起)people to die.
In Sweden(瑞典), King Gustaf Ⅲ decided to find out whether or not this was true.It happened that there were two brothers in prison at that time.They were twins and were almost alike in every way.They had both been sentenced to death (判处死刑).The King decided to let them live if one of the men agreed to drink several cups of tea each day and the other several cups of coffee.
Both brothers lived many years without problems of any kind.At last,the brother who had drunk tea every day died at the age of 83,the other died a few years later.
Because of the experiment(实验), tea and coffee got accepted (接受) and became popular as drink in Sweden, and it is one of the many countries of the world where much tea and coffee is drunk today.
—It means________.