fair-weather friend
noun [ C usually singular ] disapproving uk/ˌfeə.weð.ə ˈfrend/ us/ˌfer.weð.ɚ ˈfrend/
酒肉朋友，不能共患难的朋友
someone who is a good friend when it is easy to be one and who stops being one when you are having problems
江苏热线英汉汉英双解词典包含207361条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。