英文释义
A person who is friendly only in good situations, but who cannot be relied upon in times of trouble or misfortune. (NOTE: "fair" in this usage means "mild, pleasant")
例句
My office coworker is a fair-weather friend who will not support me in any disagreement with our boss.
我的办公室同事是不能共患难的朋友，我跟老板发生任何分歧，他都不会支持我。