A stick in the mud 形容那些保守、不愿改变或尝试新事物的(人)
e.g. Don't be such a stick-in-the-mud. Let's try something different for a change. 别那么墨守成规。让我们试试新鲜事物吧
e.g. He's always been a bit stick-in-the-mud about technology. 他在科技方面一直有点守旧。
英语从头学