求翻译：Sometimes friends move away. Then we feel very 10 . We miss them very much, but we can 11 them and write to them. It could be that we would even see them again. And we can 12 new friends. It is surprising to find out 13 we like new people when we get to know them. There’s more good news for people who have friends. They live longer than people who don’t. Why? It could be that they are 14 . Being happy helps you to stay well. Or it could be just knowing that someone cares.. If someone cares about you. you take 15 care of yourself.是什么意思？

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