1.朋友是另一个自己。 A friend is another self.

2.平生知心者,屈指能几人? Life bosom, can only a few people?

3.人类是与火交朋友的动物。 Man is to make friends with the fire of the animal.

4.我的抱负就是我的朋友。 My ambition is my only friend.