英和和英

a problem

a baffling problem

peripheral issues

a knotty problem

the guts of a problem

an elusive problem

a vexing problem

a burning question

the rootedness of the problem

an intricate problem

the housing problem

squaring the circle

a mystifying problem

an off issue

a side issue

a side question

the root of the problem

the pollution problem

a stiff problem

a gut issue

an intractable problem

a trifling matter

a sticky question

a touchy subject

a nasty problem

magnify one's problems

the maintenance-or-abolition question

a ticklish question

the question of the hour

to pose a question