Q

Who will be your real friend, a poor friend or a rich one？
贫穷的朋友和富贵的朋友，谁会成为你真正的朋友？

A

A poor friend, because a friend in need is a friend indeed.
贫穷的朋友，因为患难之交是真情。

点睛一笔

a friend in need的意思是“患难之交”，但是in need也有“需要资助的”和“穷困的”意思，从这层意思上理解a friend in need便成了“贫穷的朋友”。