晓雅的回答：

A friend in need is a friend indeed.

空了岛还是忘了潮*的回答：

a friend in need is a friend indeed. 患难见真交。 a father is a treasure, a brother is a comfort, but a friend is both. 父亲是财富，兄弟是安慰，朋友兼而有之。 a friend is not so soon gotten as lost. 交友慢，失友快。 a friend to everybody is a friend to nobody. 广交友，无深交。 a friend without faults will never be found. 没有缺点的朋友是永远找不到的。 a joke never gains an enemy but often loses a friend. 开玩笑总不能化敌为友，反而有时会失去朋友。 better lose a jest than a friend. 宁可不说一句俏皮话，以免得罪朋友们。 choose an author as you choose a friend. 选书如择友。 he that has a full purse never wants a friend. 只要袋里有，不愁没朋友。 life without a friend is death without a witness. 在世无朋友，死后无证人。 满意请采纳,谢谢