资料题：The well-known saying"An apple a day keeps the doctor away" really means that（　）。

The summer holidays are the best part of the year for most children.The weather is usually good, so that one can spend most of one's time playing in the garden or, if one live in the country, out in the woods and fields.Even if one lives in a big town, one can usually go to a park to play.The best place for a summer holiday, however, is the seaside.Some children are lucky enough to live near the sea, but for the others who do not, a week or two at one of the big seaside towns is something which they will talk about for the whole of the following year.In England, it is not only the rich who can take their children to the seaside; if a factory worker or a bus driver, a street cleaner or a waiter wants to take his wife and children to South-end and Margate, Blackpool or Clacton, he is usually quite able to do so.Now, what is it that children like so much about the seaside? I think it is the sand, sea and sun more than any other things.Of course, there are lots of new things to see, nice things to eat, and exciting things to do, but it is the feeling of sand under one's feet, of salt water on one's skin, and of the warm sun on one's back that make the seaside what it is.