problem

/ˈprɑbləm/

a state of difficulty that needs to be resolved

中文释义：问题；难题；困难

The main problem with the plan is the lack of sufficient funding.

该计划的主要问题是缺乏足够的资金。

Solving environmental problems requires global cooperation and innovation.

解决环境问题需要全球合作与创新。