习语：a fair-weather friend
知识点津：fair-weather本指“鸟亮丽的羽毛”，后用以指人“非常风光”。因此a fair-weather person 指的是aperson who stops being a friend when one is introuble，即“不能共患难的人”。
A :Doesn't she have any friends?
B :If she has, they mus befair-weather friends.
A :Such friends are even worse than enemies.
B :She'd better keep away from them.
keep away from：远离......
She had begged him to keep away from cards.
Keep away from him because he'll bend your ear for hours if given the chance.
I warned her to keep away from that bad set.
They can't keep away from their regular work for long.
I'm not clear about this matter, so I had better keep quiet.
In any case you had better hear what your wife has to say.