迷你对话
A: She is not a fair-weather friend. When I am introuble, she always helps me out.
她是一个可共患难的朋友。当我有困难时，她总是帮助我。
B: That is what friends are for.
朋友就是这样的。
地道表达
a fair-weather friend
1. 解词释义
Fair-weather字面意思是“美好的天气”，引申为“良辰美景”，真正的含义是指“只有在朋友发展顺利时分享某人的成果的朋友”。用其否定式，就是表示“能够共患难的人”。
2. 拓展例句
e.g. I cannot believe that John was a fair-weather friend of mine, because he has promised tohelp me whenever necessary.
我不信约翰会是个不能共患难的朋友，因为他曾经许诺在任何需要的时候给予我帮助。
e.g. How can you expect a fair-weather friend to help you when you're in trouble?
你如何能期望一个不讲道义的朋友为你解困呢?
e.g. Sally is a typical fair-weather friend: she's very pally when I have plenty of money butdoesn't want to know me when I haven't.
萨利是一个典型的只能同安乐不能共患难的朋友：我很有钱时她与我很亲热，但我没钱时她就不想认识我。
Ps 1：in trouble的意思是“遇到困难时，处于困境中”。例如：
If you get in trouble, don't hesitate to ask for advice.
如果碰到麻烦, 要赶紧向人求教。
If you are in trouble abroad you should see a consul.
如果在国外遇到困难，你应该去找领事。
Ps 2：help sb out的意思是“帮助某人解决困难”。例如：
We had to help him out when he was in trouble.
他遇到困难时，我们不得不帮他解决。
If Osterman wants to play the goat, why should you help him out?
如果奥斯特曼存心要胡闹，那你去给他帮腔干吗?
Ps 3：This is what friend are for. 的意思就是“这就是朋友做的事情。”或“朋友就是这样的。”
