fair-weather friend

音标发音

Sometimes you will meet fair-weather friends.
有時你會遇到不能與你共患難的朋友。
I'm a bit disappointed in John and David. It turned out they were only fair-weather friends .
我對約翰和大衛有點失望，原來他們不過是靠不住的酒肉朋友。
That boy is getting too close to those fair-weather friends. We need to get him back on the right track.
那個孩子和一些酒肉朋友越行越近，需要將他拉到正軌上來。
blog.sina.com.cn

The Saudis remain at best fair-weather friends to the US, while Israel's strength or weakness directly impacts US national security and geopolitical interests.
CENTERFORSECURITYPOLICY: America's best friends
What does seem predictable, however, is that at some point these arms will wind up in the hands of people who are not even our fair-weather friends.
CENTERFORSECURITYPOLICY: Saudi Friends and Foes
It could be that these fair-weather (if not actually false) friends have been encouraged in their intransigence by State Department interlocutors — many of whom appear to share Franco- Russian-Chinese hostility to the Bush goal of regime change in Iraq — to believe that the President will accede to efforts to dumb-down the U.S.-drafted resolution.
CENTERFORSECURITYPOLICY: Against Us

someone who is a good friend when it is easy to be one and who stops being one when you are having problems