高分求以下翻译（1）

1.We start to believe that, a more accurate symbol of intelligence is living an effective and happy life every day, every time . If you know that when you cannot solve some special difficulties , you still choose joy for yourself, or at least refuse to choose worry, then you are a intelligent person.
2.There is only one difference between the young people and the old ones, that is the young people have a promising future, but the old ones hold a good memory of past.
3.There are two lines of small willow trees on the sides of road. The branch is thin, the leaves rustling sound. And on the tender leaves is a layer of villus.