knotty problem
knotty wood
knotty issue
panelling in knotty pine.
procure a solution to a knotty problem.
She met with a lot of knotty problems.
Even the professor couldn't clarify the knotty point.
The system of the Unconstitutionality Review in our academic research of science of Law is a hot issue in China, which also is a knotty problem.
It has a website, but it still has to unlace the knotty problem facing all weeklies trying to manage themselves into an online future — what does a Web-based weekly look like?
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