whim-心血来潮
具体用法看例句：
Others have flooded their feeds with hour-by-hour itineraries, detailed breakdowns of their budget and recommendations for affordable places to eat. A hashtag challenging people to "trek from China's south to north" was widely discussed on Weibo while other popular topics included "budget travel" and "traveling on a  whim"
其他人在社交媒体上发布了每小时的行程安排、预算的详细拆分以及推荐的经济实惠餐馆。一个挑战话题“十一假期我要从南走到北'在微博上引发广泛讨论，其他热门话题包括"穷游〞和“随心游”。
摘自《BBC》20231002期-Golden Week: Chinese seek cheap wanderlust in economic gloom