疑难问题的英文：
puzzling question
- UrBan proBlems such as traffic congestion and smog
诸如交通拥挤和烟雾的城市疑难问题
adj. 令人困惑的
v. puzzle的现在分词；使迷惑
- explain puzzles
解释难题 - This mystery puzzles me.
这件神秘事情使我百思不解。 - He is in a puzzle about the matter.
他对这件事大惑不解。 - The complexity of the roadmap puzzled me.
错综复杂的公路图把我搞糊涂了。 - One that is puzzling,ambiguous,or inexplicable.
谜让人困惑、模糊、难以说清楚的物或人