A1 a situation, person, or thing that needs attention and needs to be dealt with or solved(须解决的)问题;疑难问题,困难
a question in mathematics that needs an answer数学习题,数学问题
More examples
Traffic congestion in large cities seems to be an insoluble problem.
Her only problem is lack of confidence.
I've had continual problems with this car ever since I bought it.
Tiredness, loss of appetite and sleeping problems are all classic symptoms of depression.
Desperate measures are needed to deal with the growing drug problem.
noun¹
noun²
noun
rather
usually
especially
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