Definition
If the future or success of someone or something is in doubt, it suggests that its continuation or success is uncertain.
前景未卜；不確定
The success of this project is in doubt due to a lack of funding.
由於缺乏資金，這個專案的成功與否尚不確定。
The company's long-term survival remains in doubt after experiencing two major disasters.
在經歷了兩次重大災難後，公司的長期生存仍存疑。
After years of effort, whether he can achieve his goal is still in doubt.
經過多年的努力，他能否實現目標仍存疑。