英和和英

a sticky question

a touchy subject

a nasty problem

a trifling matter

a problem

an elusive problem

an intricate problem

a complicated problem

a worrying problem

an involved problem

a difficult problem

remedy a problem

an intractable problem

a little problem

a ticklish question

solve a problem

solve a problem

pose a problem

to go to work on a problem―proceed to a question

to raise a question―give rise to a controversy

the rootedness of the problem

a difficult problem

a difficult problem

weighty problems

We have solved the problem.

a slight problem

solve problems

the point at issue

Keep to the point!

to digress from the subject―wander from the subject―wander from the point